tests(tags): add case where tag is on the right

Author: vigoux

corpus/tags.txt

@@ -35,3 +35,14 @@ Hello
       (word)))
   (line
     (word)))
+
+================================================================================
+Tag on the right
+================================================================================
+							*inclusion*
+--------------------------------------------------------------------------------
+
+(help_file
+  (line
+    (tag
+      (word))))

grammar.js

@@ -4,7 +4,6 @@ module.exports = grammar({
   extras: ($) => [/[\t ]/],
 
   rules: {
-    // TODO: add the actual grammar rules
     help_file: ($) => repeat1($.line),
 
     header: ($) => seq($.tag),