Fixing a missing link in the docs, due to a typo

Author: silverdaz

docs/notifications.rst

@@ -52,4 +52,4 @@ The message headers include:
 - delivery mode: 2 (for persistence)
 - and a correlation id.
 
-The correlation id is a uuid of 37 characters, generated by `uuid_generate <https://linux.die.net/man/3/uuid_generate>`.
+The correlation id is a uuid of 37 characters, generated by `uuid_generate <https://linux.die.net/man/3/uuid_generate>`_.