add MTR_REV_DELAY Rover param to upcoming

Author: Hwurzburg

common/source/docs/common-future-wiki-changes.rst

@@ -79,4 +79,5 @@ New Features
 - Add option to require valid location before arming, see https://github.com/ArduPilot/ardupilot_wiki/pull/6600
 - Add autoarmig option, see https://github.com/ArduPilot/ardupilot_wiki/pull/6878
 - Add LOITER/HOLD failsafe action, see https://github.com/ArduPilot/ardupilot_wiki/pull/6911
+- Add MTR_REV_DELAY, see https://github.com/ArduPilot/ardupilot_wiki/pull/6935
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