shortcode extension template - use new params and link to docs

Author: cscheid

src/resources/create/extensions/shortcode/_extensions/qstart-filesafename-qend/qstart-filesafename-qend.ejs.lua

@@ -1,5 +1,7 @@
 return {
-  ['<%= filesafename %>'] = function(args, kwargs, meta) 
+  ['<%= filesafename %>'] = function(args, kwargs, meta, raw_args, context) 
+    -- see https://quarto.org/docs/extensions/shortcodes.html
+    -- for documentation on shortcode development
     return pandoc.Str("Hello from ${title}!")
   end
 }