Adds a line linking to Special:Preferences to enotif_body message that formats watchlist-based email notifications.
This allows the receiving user to immediately go adjust their settings if they decide they don't want them.
Only changed the English message; needs to be duplicated in localizations.
(Long-term, this message should be broken up so the header lines can be handled independently.)
Your friendly {{SITENAME}} notification system
--
+To change your email notification settings, visit
+{{fullurl:{{#special:Preferences}}}}
+
To change your watchlist settings, visit
{{fullurl:{{#special:Watchlist}}/edit}}