Updating documentation for UXP Flyout Menu and Persistent Storage Migration

[harshitbhatt108]

Description

Two new pages on UXP Flyout Menu and Persistent Storage migration have been added to the UXP documentation in the recipes section.

Related Issue

[https://jira.corp.adobe.com/browse/ID-4252257]

Motivation and Context

We have added two new features to InDesign UXP, which needs documentation.

How Has This Been Tested?

The changes have been tested locally for the UI.

Screenshots (if appropriate):

UXP Flyout Menu:

Peristent Storage Migration:

Corresponding updates on whatsnew page under references:

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.