(bug 45633) Fix more occurences of "e-mail" to "email" in API

- Missed item in ApiSetNotificationTimestamp.php
- Update link to mediawiki.org in ApiEmailUser.php now that the
  page was renamed

Bug: 45633
Change-Id: I2a0a41317b9671fcd5fa1f9301cd67e619926a3e
Merge "(bug 45633) Fix more occurences of "e-mail" to "email" in API"