My Site Dashboard: Tabs - Add release notes

[zwarm]

Parent #15989

This PR adds release notes for the My Site Dashboard tabs feature

cc: @AliSoftware I'm not sure if the length is too long; but if it is, we can cut it down to My Site: your My Site screen now has two tabs, "Site Menu" and "Home". LMK. Thanks

To test:
There is nothing to test for this PR.

Regression Notes

1. Potential unintended areas of impact N/A
2. What I did to test those areas of impact (or what existing automated tests I relied on) N/A
3. What automated tests I added (or what prevented me from doing so) N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APKs:

• WordPress-pr-16269-build-120958.apk

• Jetpack-pr-16269-build-120958.apk

[AliSoftware]

cc: @AliSoftware I'm not sure if the length is too long; but if it is, we can cut it down to My Site: your My Site screen now has two tabs, "Site Menu" and "Home". LMK. Thanks

@zwarm Thanks for the consideration about this!

The RELEASE-NOTES.txt file is there to host the "developer-oriented" release notes. Those are then always reworked by our freelance writer (see the #wordpress-release-notes channel in our Slack) once we do the code freeze, to produce a more user-oriented, editorialized release notes copy (see how it recently happened during 19.6's code freeze in this PR for example). Our writer then knows about the character limit for Android's release notes on PlayStore, so she'll take this into consideration at the time 19.7 is cut and we ask her to transform those notes to a nice copy for 19.7 in 2 weeks. 😉

That being said, thanks for pointing this out. The alternate title you mentioned could for example be a starting point for our freelance writer to know how to formulate the wording about this item in a more concise manner if the notes end up too packed after more features land for 19.7 during this sprint and she need to use some conciseness 👍

[ashiagr]

LGTM 👍