Updated API reference page to move to clouddocs 1.9.3 plugin and to fix errors with server admin actions

Change-Id: Ia19e7921d62024296e151875d4107cc0e1accaf6
author: diane fleming
Add 422 error code to reboot method

bug: #1086371

Change-Id: Ie1024c9bf8e6258ca226e36626f32d20402d1356
author: diane fleming