Show wiki edits in activies

Edits of wiki pages should be shown in the Activities tab and should be included in the activities RSS feed.

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Status changed to closed

Seems like the process has changed. Reopen?

@frankgerhardt @qznc Please see https://gitlab.com/gitlab-org/gitlab-ce/issues/3491

Sorry make that https://gitlab.com/gitlab-org/gitlab-ce/issues/12411