rdsys: add playbook to alerts and extend the functionality period

Improve the alerts description, and add playbook links.

The period of "ignoring bridges by functionality" is extended to 3h as some rdsys restarts produce this alert as the functionallity doesn't stabilize until 2.5h has passed.

assigned to @meskio

mentioned in issue tpo/anti-censorship/team#140 (closed)

requested review from @lelutin

mentioned in commit 8928d5cd

merged

nice!

mentioned in issue #26 (closed)