Some clean-up to identity-admin.wadl - a few inconsistencies.

Titles for add user, update user, and delete user use wrong capitalization.
Code samples for add user and update user were incorrect.

Change-Id: I911fc04941d1a130ed40180790d3d65d18e80159
author: diane fleming
Merge "Some clean-up to identity-admin.wadl - a few inconsistencies."