Summary: Ref T2784. These are lookin' pretty stable. Subclasses like `DiffusionGetLintMessagesConduitAPIMethod` have their warnings about unstable methods, so just remove this warning in the base class.
Test Plan: Loaded `/conduit`, observed lack of unstable warnings. Only unstable methods are now `diffusion.getlintmessages`, `diffusion.looksoon`, and `diffusion.updatecoverage`.
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Maniphest Tasks: T2784
Differential Revision: https://secure.phabricator.com/D20651
2f313a0e0d