Add missing install/update topics to left nav
Add navigation item to global navigation
The following pages are missing from the left nav:
- https://docs.gitlab.com/ee/update/mysql_to_postgresql.html -> https://kpaizee-main-patch-82677.docs.gitlab-review.app/ee/update/mysql_to_postgresql.html
- https://docs.gitlab.com/ee/update/restore_after_failure.html -> https://kpaizee-main-patch-82677.docs.gitlab-review.app/ee/update/restore_after_failure.html
- https://docs.gitlab.com/ee/update/upgrading_postgresql_using_slony.html -> https://kpaizee-main-patch-82677.docs.gitlab-review.app/ee/update/upgrading_postgresql_using_slony.html
As identified in #1313 (closed) and related to technical-writing#712 (closed).
These pages are listed here https://docs.gitlab.com/ee/update/#miscellaneous, so they don't appear to have been excluded on purpose.
Edited by Kati Paizee