Fix docs.

docs/sections/settings.rst

@@ -56,14 +56,14 @@ OPTIONAL. ``int``. Code object expiration after been delivered.
 Expressed in seconds. Default is ``60*10``.
 
 OIDC_DISCOVERY_CACHE_ENABLE
-================
+===========================
 
 OPTIONAL. ``bool``. Enable caching the response on the discovery endpoint, by using default cache. Cache key will be a combination of site URL and types supported by the provider, changing any of these will invalidate stored value.
 
 Default is ``False``.
 
 OIDC_DISCOVERY_CACHE_EXPIRE
-================
+===========================
 
 OPTIONAL. ``int``. Discovery endpoint cache expiration time expressed in seconds.