[minopret]

Which wiki engine do you have in mind? There certainly is revision control in MediaWiki, Confluence, and others. Granted, I wouldn't use those in place of a source code revision control system such as git. There are generally no "annotate"/"blame" or "pickaxe" features. I would agree with writing something code-friendly in the first place, examples of which would include DocBook and Restructured Text.

[greenyoda]

There's at least one wiki that's built on top of Git:

https://github.com/gollum/gollum

[mrob]

There's also Gitit, which supports multiple VCSs including git:

https://github.com/jgm/gitit