docs: fixing wrong documentation link

This solves the problem found in python-bugzilla#161
The old link referred to the deprecated APIs.

Author: danilocesar

man/bugzilla.rst

@@ -859,4 +859,4 @@ SEE ALSO
 ========
 
 https://bugzilla.readthedocs.io/en/latest/api/index.html
-https://bugzilla.redhat.com/docs/en/html/api/Bugzilla/WebService/Bug.html
+https://bugzilla.redhat.com/docs/en/html/api/core/v1/bug.html