Removed "Justify paragraphs" from MW user Preference.

Removed the option 'Justify paragraphs' from MW Preferences
as it is not a necessary option there.
Added RELEASE NOTES.

Bug: 52810
Change-Id: I1fe6a5857070828726077e6ba229b786c017c858
Merge "Removed "Justify paragraphs" from MW user Preference."