Make sure you clearly label the edited version as such (perhaps add a "revisions" section at the bottom listing each version and the changes between them like:

2014-04-14 @12:34: Original publication

2014-04-14 @17:00: Spelling and grammar fixes

2014-04-15 @13:00: Updated wording to avoid terms potentially seen as insulting

... ... ...

Better yet, include the earlier versions and link to them in that change log. This way you are improving the article yet there is no way (unless you deliberately skip bits in the changelog) people can legitimately accuse you of trying to brush things under the carpet (because everything you edited out to improve things is still there for all to see (and find easily) should they care).

Also make sure you add a message indicating "this is an older version of the article, see link for the latest revision" to the old versions so people coming in to the wrong place from a search result know where best to go.