DOC-3200: Fixed typo in TinyMCE util tools documentation.

Author: abhinavgandham

modules/ROOT/pages/apis/tinymce.util.tools.adoc

@@ -4,7 +4,7 @@
 :keywords: each, explode, grep, hasOwnProperty, inArray, is, isArray, makeMap, map, resolve, toArray, trim, walk
 :moxie-type: api
 
-This class contains various utlity functions. These are also exposed directly on the tinymce namespace.
+This class contains various utility functions. These are also exposed directly on the tinymce namespace.
 
 [[summary]]
 == Summary