Don't include the not-yet-written HOT sections

Instead of displaying a bunch of TODOs, comment out the sections that
need to be written to provide a cleaner output.

The intent is to have a first release of the HOT guide in the user
guide.

Change-Id: I116e5c1cee1922b19cc80a2e09c261ee38a180e9
Merge "Don't include the not-yet-written HOT sections"