Fix typo.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4042148

setuptools/command/easy_install.py

@@ -772,7 +772,7 @@ PYTHONPATH, or by being added to sys.path by your code.)
 If it uses setuptools in its setup script, you can activate it in
 "development" mode by going to that directory and running::
 
-    %(python)s setup.py --develop
+    %(python)s setup.py develop
 
 See the setuptools documentation for the "develop" command for more info.
 """ % locals()