fix rst syntax for Sphinx

src/saml2/metadata.py

@@ -645,7 +645,7 @@ def _localized_name(val, klass):
 
 def do_organization_info(ava):
     """ decription of an organization in the configuration is
-    a dictionary of keys and values, where the values might be tuples:
+    a dictionary of keys and values, where the values might be tuples::
 
         "organization": {
             "name": ("AB Exempel", "se"),