Add guidance about updating store PWAs

[captainbrosset]

This PR adds some guidance about when you need to update your store app when you make changes to your PWA. Specifically, the guidance is to update the app package in the store for any change made to the web app manifest, because the information in the manifest is copied over to the msix bundle for better integration with windows.

Fixes #2828.

• Before: https://learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/microsoft-store
• After: https://review.learn.microsoft.com/en-us/microsoft-edge/progressive-web-apps-chromium/how-to/microsoft-store?branch=pr-en-us-2848

AB#46747708

[mikehoffms]

Writer/Editor review pass, main pass.

[mikehoffms]

Writer/Editor pass, 2nd review: approved

[captainbrosset]

@LuHuangMSFT I just pushed a new commit where I removed url handling and mentioned scope extensions instead. Let me know what you think.

[learn-build-service-prod]

Learn Build status updates of commit 498364d:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoft-edge/progressive-web-apps-chromium/how-to/microsoft-store.md	✅Succeeded	View
microsoft-edge/progressive-web-apps-chromium/how-to/microsoft-store-images/windows-partner-center-start-submission.png	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[LuHuangMSFT]

Content about out-of-scope UI, scope extensions, and package update all look good to me.