Add mousegrabber and keygrabber isrunning luadoc

Signed-off-by: Sébastien Luttringer <seblu@seblu.net>
Signed-off-by: Uli Schlachter <psychon@znc.in>

luadoc/keygrabber.lua

@@ -34,3 +34,9 @@ module("keygrabber")
 -- @param -
 -- @name stop
 -- @class function
+
+--- Check if the keygrabber is running.
+-- @param -
+-- @return A boolean value, true if running, false otherwise.
+-- @name isrunning
+-- @class function

luadoc/mousegrabber.lua

@@ -17,3 +17,9 @@ module("mousegrabber")
 -- @param -
 -- @name stop
 -- @class function
+
+--- Check if the mousegrabber is running.
+-- @param -
+-- @return A boolean value, true if running, false otherwise.
+-- @name isrunning
+-- @class function