Docs - product feedback: Gitaly binary location doesn't match install docs

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The documentation to install GitLab from source says I should use the following command to start Gitaly, before initializing the database:

gitlab_path=/home/git/gitlab
gitaly_path=/home/git/gitaly

sudo -u git -H sh -c "$gitlab_path/bin/daemon_with_pidfile $gitlab_path/tmp/pids/gitaly.pid \
  $gitaly_path/gitaly $gitaly_path/config.toml >> $gitlab_path/log/gitaly.log 2>&1 &"

In Gitaly's commit eb6fd60561, the binary stopped being copied to the ~/gitaly source directory, so that command doesn't work anymore. I have to use $gitaly_path/_build/bin/gitaly now.

I had to git-bisect between GitLab 13.11 and 13.12 to figure this out, which took hours (bisect eventually pointed at 2cedcd65, figuring out the responsible commit in the gitaly repo was easy then).