Merge branch 'docs/exclude-pg-geo-tests' into 'master'

Exclude 'db:rollback-pg-geo' job from docs pipelines

See merge request gitlab-org/gitlab-ee!5126

.gitlab-ci.yml

@@ -640,6 +640,7 @@ db:rollback-mysql:
 db:rollback-pg-geo: &db-rollback
   <<: *db-rollback
   <<: *use-pg
+  <<: *except-docs
   script:
     - bundle exec rake geo:db:migrate VERSION=20170627195211
     - bundle exec rake geo:db:migrate