Added a procedure and edits to HA guide

Added a procedure for the MySQL with Galera page. Also made
punctuation changes (commas), and added an extra line of
content for the introduction paragraph. Changed procedure from
implicit to explicit numbering for impending xml conversion.

Change-Id: I9a82e8c945e03eb5a616031559ada026c3548c01
backport: none
Closes-Bug: #1319624
Changed enabled from false to no for rsync to work properly

The command # rsync rsync://pub@localhost/ fails if enabled is
false. The command works properly and verifies rsync if it is no.

Change-Id: I850f9db82638a2e6f2e8078dd22a729fe996e3a7
Closes-Bug: #1321264
backport: havana icehouse
Merge "Changed enabled from false to no for rsync to work properly"
Merge "Added a procedure and edits to HA guide"