Rename class named PageTriageMissingRevisionException that is used as MWPageTriageMissingRevisionException
Rename class named PageTriageMissingRevisionException that is used as MWPageTriageMissingRevisionException

Change-Id: I46b0d470e7efe93c4b8e5089f3f3c418a2c70ee3

wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage,wikimedia/mediawiki-extensions-PageTriage