Merge branch 'change-docs-trigger-id' into 'master'

Replace trigger with the new ID of the docs project

Now that the old docs site is deprecated in
favor of https://gitlab.com/gitlab-com/gitlab-docs

See merge request !7343

.gitlab-ci.yml

@@ -331,7 +331,7 @@ trigger_docs:
   cache: {}
   artifacts: {}
   script:
-    - "curl -X POST -F token=${DOCS_TRIGGER_TOKEN} -F ref=master -F variables[PROJECT]=ce https://gitlab.com/api/v3/projects/38069/trigger/builds"
+    - "curl -X POST -F token=${DOCS_TRIGGER_TOKEN} -F ref=master -F variables[PROJECT]=ce https://gitlab.com/api/v3/projects/1794617/trigger/builds"
   only:
     - master@gitlab-org/gitlab-ce