Add the description of Gitaly timeouts to Gitaly documentation
At the moment Gitaly docs located in https://docs.gitlab.com/ce/administration/gitaly/ and https://docs.gitlab.com/ee/administration/gitaly/ do not contain any info about Gitaly timeouts that are defined in Admin Area > Settings > Preferences > Gitaly.
I suppose this info should be added to the documentation together with some recommendations how/when these timeouts can be adjusted.