Add editorialized release notes for WordPress 20.7

Author: mokagio

WordPress/metadata/release_notes.txt

@@ -1,3 +1,3 @@
-* [*] Fixes Media control toggles difficult to see [https://github.com/wordpress-mobile/WordPress-Android/pull/17068]
-* [*] Fix night mode text colors on the screens shown after scanning a Login Code [https://github.com/wordpress-mobile/WordPress-Android/pull/17086]
+We can see clearly now—media preview controls (like the back button) are now visible in both light and dark mode.
 
+The Login Code screen in the Compose theme also has better color contrast for more readable text. Shiny.