correct typo

Author: David Catmull

PBSourceViewItem.h

@@ -35,7 +35,7 @@
 - (void)removeChild:(PBSourceViewItem *)child;
 
 // This adds the ref to the path, which should match the item's title,
-// so "refs/heads/pu/pb/sidebar" would have the path [@"pu", @"pb", @"sidebare"]
+// so "refs/heads/pu/pb/sidebar" would have the path [@"pu", @"pb", @"sidebar"]
 // to the 'local' branch thing
 - (void)addRev:(PBGitRevSpecifier *)revSpecifier toPath:(NSArray *)path;
 - (PBSourceViewItem *)findRev:(PBGitRevSpecifier *)rev;