Change wording in example hook

contrib/python-hook-examples.py

@@ -1,24 +1,22 b''
 '''
-These are examples of useful hooks in Python for Mercurial.
+Examples of useful python hooks for Mercurial.
 '''
-
 from mercurial import patch, util
 
-
 def diffstat(ui, repo, **kwargs):
-    '''Use it like:
+    '''Example usage:
 
     [hooks]
     commit.diffstat = python:/path/to/this/file.py:diffstat
     changegroup.diffstat = python:/path/to/this/file.py:diffstat
     '''
     if kwargs.get('parent2'):
         return
     node = kwargs['node']
     first = repo[node].parents()[0].node()
     if 'url' in kwargs:
         last = repo['tip'].node()
     else:
         last = node
     diff = patch.diff(repo, first, last)
     ui.write(patch.diffstat(util.iterlines(diff)))