bookmarks: spelling correction in docstring

mercurial/bookmarks.py

@@ -80,7 +80,7 b' class bmstore(dict):'
 def readcurrent(repo):
     '''Get the current bookmark
 
-    If we use gittishsh branches we have a current bookmark that
+    If we use gittish branches we have a current bookmark that
     we are on. This function returns the name of the bookmark. It
     is stored in .hg/bookmarks.current
     '''