Update Gaia API documents for #6131ad93f5385e9cc3ad5f85ea44203449d671d1
    Bug 944271 - [OTA][Data Migration][Clock] The alarm events will...
   be lost after update from v1.1 to v1.2

Adds a routine to startup.js to convert old Alarm entries to the
new format.

(cherry picked from commit 979a3db21abd154efef337686e7a15d846c3d65f)