GraphQL: Add alpha deprecation reason

lib/gitlab/graphql/deprecation.rb

@@ -5,7 +5,7 @@ module Gitlab
     class Deprecation
       REASONS = {
         renamed: 'This was renamed.',
-        discouraged: 'Use of this is not recommended.'
+        alpha: 'This feature is in Alpha, and can be removed or changed at any point.'
       }.freeze
 
       include ActiveModel::Validations

spec/support/shared_examples/graphql/types/gitlab_style_deprecations_shared_examples.rb

@@ -62,9 +62,9 @@ RSpec.shared_examples 'Gitlab-style deprecations' do
     expect(deprecable.deprecation_reason).to include 'This was renamed.'
   end
 
-  it 'supports named reasons: discouraged' do
-    deprecable = subject(deprecated: { milestone: '1.10', reason: :discouraged })
+  it 'supports named reasons: alpha' do
+    deprecable = subject(deprecated: { milestone: '1.10', reason: :alpha })
 
-    expect(deprecable.deprecation_reason).to include 'Use of this is not recommended.'
+    expect(deprecable.deprecation_reason).to include 'This feature is in Alpha'
   end
 end