Update zero downtime update steps to cover single, multi/HA and geo
See the general Documentation guidelines https://docs.gitlab.com/ee/development/doc_styleguide.html
What does this MR do?
The zero downtime update steps were a little light on, only covering single and multi/HA deployments and not geo. This MR adds steps for updating Geo deployments as well as breaking the steps into three sections (single, multi/HA and geo) for improved readability.
Current:
New:
Changing the header title?
[ ] Is it completely necessary to change the title? Changing titles breaks deep linking. If yes, proceed further.[ ] Move the old heading title to the bottom of the page[ ] Change the header tag to h5,#####
Moving docs to a new location?
See the guidelines: https://docs.gitlab.com/ee/development/doc_styleguide.html#changing-document-location
[ ] Make sure the old link is not removed and has its contents replaced with a link to the new location.-
Make sure internal links pointing to the document in question are not broken.
What are the relevant issue numbers?
Edited by GitLab Release Tools Bot