Ignore H803 from Hacking.

H803 checks for the absence of a period in commit messages, something
the community clearly rejected as a sensible check: periods in commit
messages should neither be rejected or required.

Change-Id: I49c981a089bc7f41450e58d193ca4b609d092df3
fix rst syntax in database schema migrations docs

Change-Id: Idde4cf9b472663da63b1cf16bcec83a3100fab5e
Merge "Ignore H803 from Hacking."
Merge "fix rst syntax in database schema migrations docs"