Correcting typo in plugins section

Fixing the example of the plugin's name as the last component
of the git repo path should be foo.

Change-Id: I2f12d4d26993ec192517de7f5541c4219ee59ed9
diff --git a/doc/source/plugins.rst b/doc/source/plugins.rst
index 89b9381..c694729 100644
--- a/doc/source/plugins.rst
+++ b/doc/source/plugins.rst
@@ -58,7 +58,7 @@
   plugin's name, which is the name that should be used by users on
   "enable_plugin" lines.  It should generally be the last component of
   the git repo path (e.g., if the plugin's repo is
-  openstack/devstack-foo, then the name here should be "foo") ::
+  openstack/foo, then the name here should be "foo") ::
 
     define_plugin <YOUR PLUGIN>
 
@@ -148,7 +148,7 @@
 
 ``devstack/settings``::
 
-    # settings file for template
+  # settings file for template
   enable_service template