Document that mkpath() returns true if the path already exists.

ie: Does not return if the path was made or not.

src/sbbs3/js_global.c

@@ -4704,7 +4704,7 @@ static jsSyncMethodSpec js_global_functions[] = {
 	,310
 	},		
 	{"mkpath",			js_mkpath,			1,	JSTYPE_BOOLEAN,	JSDOCSTR("path/directory")
-	,JSDOCSTR("make a path to a directory (creating all necessary sub-directories)")
+	,JSDOCSTR("make a path to a directory (creating all necessary sub-directories). Returns true if the directory already exists.")
 	,315
 	},		
 	{"rmdir",			js_rmdir,			1,	JSTYPE_BOOLEAN,	JSDOCSTR("path/directory")