The Help URI of a plugin will typically be presented by the plugin manager
as a "Help" button linking to the URI. It can either be a HTTP URL on some
website or a ghelp: URI if a Gnome help page is available for the plugin.
The relevant key in the plugin info file is "Help". Other platform-specific
keys exist for platform-specific help files. Those are "Help-GNOME",
"Help-Windows" and "Help-MacOS-X".
Gets the help URI of the plugin.
The Help URI of a plugin will typically be presented by the plugin manager as a "Help" button linking to the URI. It can either be a HTTP URL on some website or a ghelp: URI if a Gnome help page is available for the plugin.
The relevant key in the plugin info file is "Help". Other platform-specific keys exist for platform-specific help files. Those are "Help-GNOME", "Help-Windows" and "Help-MacOS-X".
Return: the plugin's help URI.