Summary: Ref T992. I noticed that `ManiphestTask` mail doesn't render Remarkup properly (instead, it renders Remarkup literally). I //think// this is because the code calls `addTextSection()` rather than `addRemarkupSection()`.
Test Plan: Created a new Maniphest Task and saw Remarkup in the generated self-email (inspect the email contents with `./bin/mail show-outbound`). I didn't test the other affected applications.
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin
Maniphest Tasks: T992
Differential Revision: https://secure.phabricator.com/D14511
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