I edited two posts so far. And I never saw my changes were accepted nor rejected. In the edit history they do not show up.
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You can see all edit suggestions you've made in your own account, on the "activity" tab, with the "suggestions" filter:
It looks like you've made four suggestions. The last two have been rejected, but the first two were approved. Each link in that list goes to a page for the suggestion, which will show you the rejection reasons. Rejected suggestions don't appear in the post's revisions list because, well, they didn't make a revision and aren't part of the history.