[MERGE][trivial] Typo in _is_remote_before's docstring

[Martin Pool]

Martin Pool has voted approve.
Status is now: Semi-approved
Comment:
Seems useful, thanks, though I believe there might be some more 
substantial changes coming up in this area.

If you would like another similar though larger project, you could try 
running the test suite under the imminent python2.6beta.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C48589102.6090003%40mattnordhoff.com%3E