Fixing comments in ligoauth/migrations/0006

gracedb/ligoauth/migrations/0006_update_cwb_account.py

 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.5 on 2018-04-30 16:12
 #
-# This migration adds a new "emfollow" user which will be used for
-# EM follow-up activities.  The old EM follow-up accounts will be deactivated
-# and their X509Certs will be deleted.
+# This migration updates certificates for the waveburst (CWB) account
+# and also updates the account e-mail
 
 from __future__ import unicode_literals