The default template file will be generated from HiveConf.java after
HIVE-6037 commits, so don't bother updating the template. The HiveConf.java comments for hive.server2.authentication.pam.services will be moved into the parameter definition and then go into the template file.
If you want to revise the parameter description before
HIVE-6037 commits, I suggest adding a JIRA comment on HIVE-6037 asking Navis to make the change in his patch. After it commits, you can just revise HiveConf.java directly.