Fix a typo in the post-review documentation.
Fix a typo in the post-review documentation.

The docs talk about "unchanged" files when they should say "uncommitted" files.

Fixes bug #1365

1tush/reviewboard,chazy/reviewboard,sgallagher/reviewboard,sgallagher/reviewboard,Khan/reviewboard,beol/reviewboard,atagar/ReviewBoard,chazy/reviewboard,atagar/ReviewBoard,davidt/reviewboard,chipx86/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,beol/reviewboard,KnowNo/reviewboard,1tush/reviewboard,chipx86/reviewboard,atagar/ReviewBoard,chazy/reviewboard,beol/reviewboard,custode/reviewboard,reviewboard/reviewboard,chipx86/reviewboard,Khan/reviewboard,Khan/reviewboard,davidt/reviewboard,Khan/reviewboard,Khan/reviewboard,1tush/reviewboard,KnowNo/reviewboard,chazy/reviewboard,beol/reviewboard,Khan/reviewboard,davidt/reviewboard,davidt/reviewboard,KnowNo/reviewboard,1tush/reviewboard,1tush/reviewboard,bkochendorfer/reviewboard,bkochendorfer/reviewboard,brennie/reviewboard,1tush/reviewboard,KnowNo/reviewboard,atagar/ReviewBoard,bkochendorfer/reviewboard,brennie/reviewboard,reviewboard/reviewboard,Khan/reviewboard,chazy/reviewboard,sgallagher/reviewboard,brennie/reviewboard,atagar/ReviewBoard,custode/reviewboard,Khan/reviewboard,chazy/reviewboard,Khan/reviewboard,chipx86/reviewboard,custode/reviewboard,brennie/reviewboard,atagar/ReviewBoard,atagar/ReviewBoard,chazy/reviewboard,reviewboard/reviewboard,atagar/ReviewBoard,atagar/ReviewBoard,custode/reviewboard,1tush/reviewboard,reviewboard/reviewboard,chazy/reviewboard,sgallagher/reviewboard,chazy/reviewboard,1tush/reviewboard