Pop 'password' in user_update v3 if it is left blank

password should not be changed when update user with password left blank

Fixes: bug #1186160

Change-Id: I24daa4ad05f0659e0aa06e469b0eb777f1595603
Fix spelling errors.

Fix a couple of spelling mistakes in docs that I noticed while reading.

Change-Id: Iea6898c743545dcfb3cab9fe9003a647b91bd93b
Merge "Pop 'password' in user_update v3 if it is left blank"
Merge "Fix spelling errors."