formatting of setup.cfg code snippet

see https://github.com/pallets/flask/issues/2400

docs/patterns/distribute.rst

@@ -89,14 +89,14 @@ Tagging Builds
 --------------
 
 It is useful to distinguish between release and development builds.  Add a
-:file:`setup.cfg` file to configure these options.
+:file:`setup.cfg` file to configure these options::
 
     [egg_info]
     tag_build = .dev
     tag_date = 1
 
     [aliases]
-    release = egg_info -RDb ''
+    release = egg_info -RDb
 
 Running ``python setup.py sdist`` will create a development package
 with ".dev" and the current date appended: ``flaskr-1.0.dev20160314.tar.gz``.