Rename some remarkup classes
Summary: Ref T5655. Rename DoorkeeperRemarkupRuleAsana and DoorkeeperRemarkupRuleJIRA for consistency.
Test Plan: N/A
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T5655
Differential Revision: https://secure.phabricator.com/D13165