Fix RFC 5952 link (#1311)

This fixes a bug in 878e61c

Author: msiegen

aip/general/0202.md

@@ -116,5 +116,6 @@ enumeration itself.
 [rfc 4122]: https://datatracker.ietf.org/doc/html/rfc4122
 [rfc 791]: https://datatracker.ietf.org/doc/html/rfc791
 [rfc 4291]: https://datatracker.ietf.org/doc/html/rfc4291#section-2.2
+[rfc 5952]: https://datatracker.ietf.org/doc/html/rfc5952
 [ietf rfc]: https://www.ietf.org/standards/rfcs
 [java uuid]: https://docs.oracle.com/javase/8/docs/api/java/util/UUID.html