Update to current script parameter syntax

Author: ctrueden

src/main/resources/script_templates/Examples/Invert_image.rb

@@ -1,4 +1,4 @@
-# @ImagePlus i
+#@ ImagePlus i
 # A basic script that inverts the current image.
 # NB: this requires that an image is already open.
 # The ImagePlus is populated automatically via the

src/main/resources/script_templates/Intro/Greeting.rb

@@ -1,5 +1,5 @@
-# @String name
-# @OUTPUT String greeting
+#@ String name
+#@output String greeting
 
 # A JRuby script with parameters.
 # It is the duty of the scripting framework to harvest