Merge pull request #13621 from Intrepidd/patch-1

Fix typo in image_tag documentation [ci skip]

actionview/lib/action_view/helpers/asset_tag_helper.rb

@@ -176,7 +176,7 @@ def favicon_link_tag(source='favicon.ico', options={})
       # ==== Options
       #
       # You can add HTML attributes using the +options+. The +options+ supports
-      # three additional keys for convenience and conformance:
+      # two additional keys for convenience and conformance:
       #
       # * <tt>:alt</tt>  - If no alt text is given, the file name part of the
       #   +source+ is used (capitalized and without the extension)