The \nUser at the end should be \"User.
I.e.
"Html example used in the help section \"discussion\" of the toolbar.\n\nParameters:\n* $1 - The \"User\" namespace name\n* $2 - The \nUser talk\" namespace name",
should be
"Html example used in the help section \"discussion\" of the toolbar.\n\nParameters:\n* $1 - The \"User\" namespace name\n* $2 - The \"User talk\" namespace name",
URL: https://translatewiki.net/wiki/MediaWiki:Wikieditor-toolbar-help-content-signature-result/qqq