Update release notes with more descriptive message

Author: ovitrif

RELEASE-NOTES.txt

@@ -3,7 +3,7 @@
 20.5
 -----
 * [*] Use larger thumbnail previews for recommended themes during site creation [https://github.com/wordpress-mobile/WordPress-Android/pull/16848]
-* [*] Login: Fix an issue when logging in with email addresses containing a single quote [https://github.com/wordpress-mobile/WordPress-Android/pull/15526]
+* [*] Login: Fix an issue preventing some users to log-in in with email addresses containing a single quote [https://github.com/wordpress-mobile/WordPress-Android/pull/15526]
 
 
 20.4