pfSense/pfsense 846dfa4src/usr/local/www services_dyndns_edit.php

Allow no username for FreeDNS-v6

Also include that and Digital Ocean in the help text.

(cherry picked from commit 92c39e9b923792a58b56323a7e2fb46f608b447f)
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+2-2src/usr/local/www/services_dyndns_edit.php
+2-21 files

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