(GH-11248) Clarify behavior for Register-ArgumentCompleter parameters

Prior to this change, the `Register-ArgumentCompleter` reference didn't indicate that
specifying the **CommandName** parameter without the **ParameterName** or **Native**
parameters causes the command to behave as if the user specified the `-Native` switch.

This change:

- Clarifies that users should always specify the **ParameterName** parameter when
  registering an argument completer for a PowerShell command.
- Resolves #11248
- Fixes AB#281953

reference/5.1/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md

@@ -2,7 +2,7 @@
 external help file: System.Management.Automation.dll-Help.xml
 Locale: en-US
 Module Name: Microsoft.PowerShell.Core
-ms.date: 12/09/2022
+ms.date: 07/10/2024
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/register-argumentcompleter?view=powershell-5.1&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: Register-ArgumentCompleter
@@ -36,6 +36,12 @@ The `Register-ArgumentCompleter` cmdlet registers a custom argument completer. A
 completer allows you to provide dynamic tab completion, at run time for any command that you
 specify.
 
+When you call this command with the **CommandName** parameter and without the **ParameterName** or
+**Native** parameters, the command runs as if you specified the **Native** parameter. This prevents
+the argument completer from working for PowerShell command parameters. Always specify the
+**ParameterName** parameter when you want to register an argument completer for a PowerShell
+command.
+
 ## EXAMPLES
 
 ### Example 1: Register a custom argument completer
@@ -182,6 +188,10 @@ cannot be an enumerated value, such as the **ForegroundColor** parameter of the
 
 For more information on enums, see [about_Enum](./About/about_Enum.md).
 
+When registering an argument completer for a specific PowerShell command, always specify this
+parameter. When you specify the **CommandName** parameter without the **ParameterName** or
+**Native** parameters, the command behaves as if you specified the **Native** parameter.
+
 ```yaml
 Type: System.String
 Parameter Sets: PowerShellSet

reference/7.2/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md

@@ -2,7 +2,7 @@
 external help file: System.Management.Automation.dll-Help.xml
 Locale: en-US
 Module Name: Microsoft.PowerShell.Core
-ms.date: 12/09/2022
+ms.date: 07/10/2024
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/register-argumentcompleter?view=powershell-7.2&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: Register-ArgumentCompleter
@@ -36,6 +36,12 @@ The `Register-ArgumentCompleter` cmdlet registers a custom argument completer. A
 completer allows you to provide dynamic tab completion, at run time for any command that you
 specify.
 
+When you call this command with the **CommandName** parameter and without the **ParameterName** or
+**Native** parameters, the command runs as if you specified the **Native** parameter. This prevents
+the argument completer from working for PowerShell command parameters. Always specify the
+**ParameterName** parameter when you want to register an argument completer for a PowerShell
+command.
+
 ## EXAMPLES
 
 ### Example 1: Register a custom argument completer
@@ -182,6 +188,10 @@ cannot be an enumerated value, such as the **ForegroundColor** parameter of the
 
 For more information on enums, see [about_Enum](./About/about_Enum.md).
 
+When registering an argument completer for a specific PowerShell command, always specify this
+parameter. When you specify the **CommandName** parameter without the **ParameterName** or
+**Native** parameters, the command behaves as if you specified the **Native** parameter.
+
 ```yaml
 Type: System.String
 Parameter Sets: PowerShellSet

reference/7.4/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md

@@ -2,7 +2,7 @@
 external help file: System.Management.Automation.dll-Help.xml
 Locale: en-US
 Module Name: Microsoft.PowerShell.Core
-ms.date: 12/09/2022
+ms.date: 07/10/2024
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/register-argumentcompleter?view=powershell-7.4&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: Register-ArgumentCompleter
@@ -36,6 +36,12 @@ The `Register-ArgumentCompleter` cmdlet registers a custom argument completer. A
 completer allows you to provide dynamic tab completion, at run time for any command that you
 specify.
 
+When you call this command with the **CommandName** parameter and without the **ParameterName** or
+**Native** parameters, the command runs as if you specified the **Native** parameter. This prevents
+the argument completer from working for PowerShell command parameters. Always specify the
+**ParameterName** parameter when you want to register an argument completer for a PowerShell
+command.
+
 ## EXAMPLES
 
 ### Example 1: Register a custom argument completer
@@ -182,6 +188,10 @@ cannot be an enumerated value, such as the **ForegroundColor** parameter of the
 
 For more information on enums, see [about_Enum](./About/about_Enum.md).
 
+When registering an argument completer for a specific PowerShell command, always specify this
+parameter. When you specify the **CommandName** parameter without the **ParameterName** or
+**Native** parameters, the command behaves as if you specified the **Native** parameter.
+
 ```yaml
 Type: System.String
 Parameter Sets: PowerShellSet

reference/7.5/Microsoft.PowerShell.Core/Register-ArgumentCompleter.md

@@ -2,7 +2,7 @@
 external help file: System.Management.Automation.dll-Help.xml
 Locale: en-US
 Module Name: Microsoft.PowerShell.Core
-ms.date: 12/09/2022
+ms.date: 07/10/2024
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/register-argumentcompleter?view=powershell-7.5&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: Register-ArgumentCompleter
@@ -36,6 +36,12 @@ The `Register-ArgumentCompleter` cmdlet registers a custom argument completer. A
 completer allows you to provide dynamic tab completion, at run time for any command that you
 specify.
 
+When you call this command with the **CommandName** parameter and without the **ParameterName** or
+**Native** parameters, the command runs as if you specified the **Native** parameter. This prevents
+the argument completer from working for PowerShell command parameters. Always specify the
+**ParameterName** parameter when you want to register an argument completer for a PowerShell
+command.
+
 ## EXAMPLES
 
 ### Example 1: Register a custom argument completer
@@ -182,6 +188,10 @@ cannot be an enumerated value, such as the **ForegroundColor** parameter of the
 
 For more information on enums, see [about_Enum](./About/about_Enum.md).
 
+When registering an argument completer for a specific PowerShell command, always specify this
+parameter. When you specify the **CommandName** parameter without the **ParameterName** or
+**Native** parameters, the command behaves as if you specified the **Native** parameter.
+
 ```yaml
 Type: System.String
 Parameter Sets: PowerShellSet