Docs aren't reviewed using roulette

lib/gitlab/danger/helper.rb

@@ -99,15 +99,15 @@ module Gitlab
       end
       CATEGORY_LABELS = {
-        docs: "~Documentation",
+        docs: "~Documentation", # Docs are reviewed along DevOps stages, so don't need roulette for now.
         none: "",
         qa: "~QA"
       }.freeze
       # rubocop:disable Style/RegexpLiteral
       CATEGORIES = {
-        %r{\Adoc/} => :docs,
-        %r{\A(CONTRIBUTING|LICENSE|MAINTENANCE|PHILOSOPHY|PROCESS|README)(\.md)?\z} => :docs,
+        %r{\Adoc/} => :none, # To reinstate roulette for documentation, set to `:docs`.
+        %r{\A(CONTRIBUTING|LICENSE|MAINTENANCE|PHILOSOPHY|PROCESS|README)(\.md)?\z} => :none, # To reinstate roulette for documentation, set to `:docs`.
         %r{\A(ee/)?app/(assets|views)/} => :frontend,
         %r{\A(ee/)?public/} => :frontend,
@@ -148,7 +148,7 @@ module Gitlab
         # Fallbacks in case the above patterns miss anything
         %r{\.rb\z} => :backend,
-        %r{\.(md|txt)\z} => :docs,
+        %r{\.(md|txt)\z} => :none, # To reinstate roulette for documentation, set to `:docs`.
         %r{\.js\z} => :frontend
       }.freeze
       # rubocop:enable Style/RegexpLiteral

spec/lib/gitlab/danger/helper_spec.rb

@@ -191,9 +191,8 @@ describe Gitlab::Danger::Helper do
       expect(helper.changes_by_category).to eq(
         backend: %w[foo.rb],
         database: %w[db/foo],
-        docs: %w[foo.md],
         frontend: %w[foo.js],
-        none: %w[ee/changelogs/foo.yml],
+        none: %w[ee/changelogs/foo.yml foo.md],
         qa: %w[qa/foo],
         unknown: %w[foo]
       )
@@ -202,13 +201,13 @@ describe Gitlab::Danger::Helper do
   describe '#category_for_file' do
     where(:path, :expected_category) do
-      'doc/foo'         | :docs
-      'CONTRIBUTING.md' | :docs
-      'LICENSE'         | :docs
-      'MAINTENANCE.md'  | :docs
-      'PHILOSOPHY.md'   | :docs
-      'PROCESS.md'      | :docs
-      'README.md'       | :docs
+      'doc/foo'         | :none
+      'CONTRIBUTING.md' | :none
+      'LICENSE'         | :none
+      'MAINTENANCE.md'  | :none
+      'PHILOSOPHY.md'   | :none
+      'PROCESS.md'      | :none
+      'README.md'       | :none
       'ee/doc/foo'      | :unknown
       'ee/README'       | :unknown
@@ -272,8 +271,8 @@ describe Gitlab::Danger::Helper do
       'foo/bar.rb'  | :backend
       'foo/bar.js'  | :frontend
-      'foo/bar.txt' | :docs
-      'foo/bar.md'  | :docs
+      'foo/bar.txt' | :none
+      'foo/bar.md'  | :none
     end
     with_them do