fix: Custom widget callout (appsmithorg#2090)

## Description 

Provide a concise summary of the changes made in this pull request.

- 

## Type of PR

Check the appropriate box:

- [ ] Review Fixes
- [ ] Documentation Overhaul
- [ ] Feature/Story
    - Link one or more Engineering Tickets

        * 

- [ ] A-Force
- [ ] Error in documentation

## Documentation tickets
 Link to one or more documentation tickets:
 
 - 

## Checklist
Choose only the ones that are applicable.

- [ ] Checked for Grammarly suggestions.
- [ ] Adhered to the writing checklist.
- [ ] Adhered the media checklist.
- [ ] Verified and updated cross-references or added redirect rules.
- [ ] Tested the redirect rules on deploy preview.
- [ ] Validated the modifications made to the content on deploy preview.
- [ ] Validated the CSS modifications on different screen sizes.

website/docs/reference/widgets/custom.md

@@ -4,9 +4,6 @@ While Appsmith provides an extensive array of built-in widgets for application d
 
 See [How to create Custom widgets](/build-apps/how-to-guides/Create-Custom-Widgets-Using-Iframe).
 
-:::info
-Currently, Custom widget is only available on Appsmith Cloud.
-:::
 
 ## Content properties