Better message wording. See also https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Prefs-help-watchlist-token2/en

Change-Id: Ic2dec419fd1cf193af5e8067fdfb73e4c41401d4
Merge "Better message wording. See also https://translatewiki.net/wiki/Thread:Support/About_MediaWiki:Prefs-help-watchlist-token2/en"