Fix rST syntax.

Author: jezdez

docs/settings.rst

@@ -157,7 +157,7 @@ tokens. When set to ``None``, this field is excluded from tokens and is not
 validated.
 
 ``JWK_URL``
-----------
+-----------
 
 The JWK_URL is used to dynamically resolve the public keys needed to verify the
 signing of tokens. When using Auth0 for example you might set this to
@@ -274,15 +274,15 @@ The claim name that is used to store the expiration time of a sliding token's
 refresh period.  More about this in the "Sliding tokens" section below.
 
 ``CHECK_REVOKE_TOKEN``
---------------------
+----------------------
 
 If this field is set to ``True``, the system will verify whether the token
 has been revoked or not by comparing the md5 hash of the user's current
 password with the value stored in the REVOKE_TOKEN_CLAIM field within the
 payload of the JWT token.
 
 ``REVOKE_TOKEN_CLAIM``
---------------------
+----------------------
 
 The claim name that is used to store a user hash password.
 If the value of this CHECK_REVOKE_TOKEN field is ``True``, this field will be