Remove migration guide comment:

They're accessible after doing `rails g migration` anyway. Though I somehow feel this comment could be useful for someone who's new and just browsing the source.

Remove migration guide comment:
9f210180 · Lin Jen-Shin · 7b06acea · 9f210180
Commit 9f210180 authored Jul 01, 2016 by Lin Jen-Shin
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20160628085157_add_artifacts_size_to_ci_builds.rb db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb +0 -3

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--- a/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb
+++ b/db/migrate/20160628085157_add_artifacts_size_to_ci_builds.rb
-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class AddArtifactsSizeToCiBuilds < ActiveRecord::Migration
  include Gitlab::Database::MigrationHelpers