Fix letter case of some words

"Pagerduty" and "pagerduty" are changed to "PagerDuty".
"url" is changed to "URL".

Change-Id: I55d1f1913d565d846d19d1ca811f44575d958beb

monitoring/notifications/constants.py

@@ -25,7 +25,7 @@ class NotificationType(object):
 
     CHOICES = [(EMAIL, _("Email")),
                (WEBHOOK, _("Webhook")),
-               (PAGERDUTY, _("Pagerduty")),]
+               (PAGERDUTY, _("PagerDuty")),]
 
     @staticmethod
     def get_label(key):

monitoring/notifications/templates/notifications/_create.html

@@ -22,7 +22,7 @@
       The Type field indicates how the notification is sent when an alarm is triggered.
     {% endblocktrans %}</p>
     <p>{% blocktrans %}
-      The Address field indicates the email address, url, or pagerduty service
+      The Address field indicates the email address, URL, or PagerDuty service
       key to be notified.
     {% endblocktrans %}</p>
   </div>