bpo-34788 Documentation fix

Author: opavliuk

Doc/library/ipaddress.rst

@@ -221,7 +221,7 @@ write code that handles both IP versions correctly.  Address objects are
    3. An integer packed into a :class:`bytes` object of length 16, big-endian.
    4. String IPv6 address may contain scope (or zone) id in format <address>%<scope_id>.
       Scope id could not be blank or negative integer.
-      See :RFC: `4007` for details.
+      See :RFC:`4007` for details.
 
    >>> ipaddress.IPv6Address('2001:db8::1000')
    IPv6Address('2001:db8::1000')