(AB-168933) Clarify Length and Count for PSCustomObject

Prior to this change, the documentation note for the **Length**
and **Count** properties of **PSCustomObjects** created by
casting a hashtable indicated that, for Windows PowerShell,
those properties don't exist on the object and accessing them
returns `$null`.

However, in PowerShell, those members exist and return a value
of `1`.

This change:

- Updates the note to indicate the changed behavior.
- Fixes AB#168933

reference/5.1/Microsoft.PowerShell.Core/About/about_PSCustomObject.md

@@ -1,7 +1,7 @@
 ---
 description: Explains the differences between the [psobject] and [pscustomobject] type accelerators.
 Locale: en-US
-ms.date: 12/05/2022
+ms.date: 10/11/2023
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pscustomobject?view=powershell-5.1&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about PSCustomObject
@@ -219,7 +219,7 @@ have subtle side effects.
 ## Notes
 
 In Windows PowerShell, objects created by casting a **Hashtable** to
-`[pscustomobject]` do not have the **Length** or **Count** properties.
+`[pscustomobject]` don't have the **Length** or **Count** properties.
 Attempting to access these members returns `$null`.
 
 For example:
@@ -236,6 +236,10 @@ PS> $object.Count
 PS> $object.Length
 ```
 
+Starting in PowerShell 6, objects created by casting a **Hashtable** to
+`[pscustomobject]` always have a value of `1` for the **Length** and **Count**
+properties.
+
 ## See also
 
 - [about_Object_Creation][01]

reference/7.2/Microsoft.PowerShell.Core/About/about_PSCustomObject.md

@@ -1,7 +1,7 @@
 ---
 description: Explains the differences between the [psobject] and [pscustomobject] type accelerators.
 Locale: en-US
-ms.date: 12/05/2022
+ms.date: 10/11/2023
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_PSCustomObject?view=powershell-7.2&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about PSCustomObject
@@ -214,7 +214,7 @@ have subtle side effects.
 ## Notes
 
 In Windows PowerShell, objects created by casting a **Hashtable** to
-`[pscustomobject]` do not have the **Length** or **Count** properties.
+`[pscustomobject]` don't have the **Length** or **Count** properties.
 Attempting to access these members returns `$null`.
 
 For example:
@@ -231,6 +231,10 @@ PS> $object.Count
 PS> $object.Length
 ```
 
+Starting in PowerShell 6, objects created by casting a **Hashtable** to
+`[pscustomobject]` always have a value of `1` for the **Length** and **Count**
+properties.
+
 ## See also
 
 - [about_Object_Creation][01]

reference/7.3/Microsoft.PowerShell.Core/About/about_PSCustomObject.md

@@ -1,7 +1,7 @@
 ---
 description: Explains the differences between the [psobject] and [pscustomobject] type accelerators.
 Locale: en-US
-ms.date: 12/05/2022
+ms.date: 10/11/2023
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pscustomobject?view=powershell-7.3&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about PSCustomObject
@@ -214,7 +214,7 @@ have subtle side effects.
 ## Notes
 
 In Windows PowerShell, objects created by casting a **Hashtable** to
-`[pscustomobject]` do not have the **Length** or **Count** properties.
+`[pscustomobject]` don't have the **Length** or **Count** properties.
 Attempting to access these members returns `$null`.
 
 For example:
@@ -231,6 +231,10 @@ PS> $object.Count
 PS> $object.Length
 ```
 
+Starting in PowerShell 6, objects created by casting a **Hashtable** to
+`[pscustomobject]` always have a value of `1` for the **Length** and **Count**
+properties.
+
 ## See also
 
 - [about_Object_Creation][01]

reference/7.4/Microsoft.PowerShell.Core/About/about_PSCustomObject.md

@@ -1,7 +1,7 @@
 ---
 description: Explains the differences between the [psobject] and [pscustomobject] type accelerators.
 Locale: en-US
-ms.date: 12/05/2022
+ms.date: 10/11/2023
 online version: https://learn.microsoft.com/powershell/module/microsoft.powershell.core/about/about_pscustomobject?view=powershell-7.4&WT.mc_id=ps-gethelp
 schema: 2.0.0
 title: about PSCustomObject
@@ -214,7 +214,7 @@ have subtle side effects.
 ## Notes
 
 In Windows PowerShell, objects created by casting a **Hashtable** to
-`[pscustomobject]` do not have the **Length** or **Count** properties.
+`[pscustomobject]` don't have the **Length** or **Count** properties.
 Attempting to access these members returns `$null`.
 
 For example:
@@ -231,6 +231,10 @@ PS> $object.Count
 PS> $object.Length
 ```
 
+Starting in PowerShell 6, objects created by casting a **Hashtable** to
+`[pscustomobject]` always have a value of `1` for the **Length** and **Count**
+properties.
+
 ## See also
 
 - [about_Object_Creation][01]