Categorize Vale rules files for Dangerbot

Also US spelling fix and a link

danger/metadata/Dangerfile

@@ -20,7 +20,7 @@ if gitlab.mr_body.size < 5
 end
 
 if (THROUGHPUT_LABELS & gitlab.mr_labels).empty?
-  warn 'Please add a [merge request type](https://about.gitlab.com/handbook/engineering/metrics/#data-classification) to this merge request.'
+  warn 'Please add a [merge request type](https://about.gitlab.com/handbook/engineering/metrics/#work-type-classification) to this merge request.'
 end
 
 unless gitlab.mr_json["assignee"]

danger/roulette/Dangerfile

@@ -40,9 +40,9 @@ There are no reviewer and maintainer suggestions for the changes in this MR.
 MARKDOWN
 
 UNKNOWN_FILES_MESSAGE = <<MARKDOWN
-### Uncategorised files
+### Uncategorized files
 
-These files couldn't be categorised, so Danger was unable to suggest a reviewer.
+These files couldn't be categorized, so Danger was unable to suggest a reviewer.
 Please consider creating a merge request to
 [add support](https://gitlab.com/gitlab-org/gitlab/blob/master/tooling/danger/project_helper.rb)
 for them.

tooling/danger/project_helper.rb

@@ -40,7 +40,7 @@ module Tooling
         %r{\A(ee/)?config/feature_flags/} => :feature_flag,
 
         %r{\Adoc/development/usage_ping/dictionary\.md\z} => [:docs, :product_intelligence],
-        %r{\Adoc/.*(\.(md|png|gif|jpg))\z} => :docs,
+        %r{\Adoc/.*(\.(md|png|gif|jpg|yml))\z} => :docs,
         %r{\A(CONTRIBUTING|LICENSE|MAINTENANCE|PHILOSOPHY|PROCESS|README)(\.md)?\z} => :docs,
         %r{\Adata/whats_new/} => :docs,