fixing formatting issues on backport guidelines

Author: shravantc

Developer-guide/Backport Guidelines.md

@@ -23,15 +23,13 @@ that do not apply cleanly will need some manual modifications and using
 3.  Cherry pick the change from master.
 
                 $ git cherry-pick -x a0b1c2d3e4f5
-
  -   verify that the change has been merged in the master branch.
 
 4.  Update/correct the commit message.
 
                 $ git commit -s --amend --date="$(date)"
 
  [This is one example](https://github.com/gluster/glusterfs/commit/40407afb529f6e5fa2f79e9778c2f527122d75eb) of the commit message that has a good description for a backport. Notice the indention of the patch-metadata like BUG, Change-ID and Reviewed-on tags. There is also the original commit-id that was cherry picked from the master branch.
-
  -   make sure to quote the review tags
  -   update the BUG reference, point to the BUG that is used for this
     particular release-branch