Clarify usage of Gitaly path when running on standalone Gitaly server
### Problem to solve https://gitlab.com/gitlab-org/gitlab-ce/commit/0923fbf75be44770b8ce01321cd304662e15d5d5 removes example of using `path` in Gitaly config and states `` In some cases, you'll have to set `path` for `gitaly['storage']` `` yet gives no details on what those cases are. ### Further details <!-- * Any concepts, procedures, reference info we could add to make it easier to successfully use GitLab? * Include use cases, benefits, and/or goals for this work. * If adding content: What audience is it intended for? (What roles and scenarios?) For ideas, see personas at https://design.gitlab.com/research/personas or the persona labels at https://gitlab.com/groups/gitlab-org/-/labels?utf8=%E2%9C%93&subscribed=&search=persona%3A --> ### Proposal * [x] address inconsistent wording: "you need to configure storage paths"... then shows no example of setting storage `path` * [ ] address irrelevant note: "In most or all cases, the storage paths below end in `/repositories` which is not that case"... again no example of setting `path` is even shown * [ ] state what happens by default when `path` is excluded * [ ] state when `path` should be included or excluded * [ ] update https://gitlab.com/charts/gitlab/blob/master/doc/advanced/external-gitaly/external-omnibus-gitaly.md#configure-omnibus-gitlab as is supposed to happen when https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/administration/gitaly/index.md is updated ### Who can address the issue @eread @axil @zj-gitlab ### Other links/references <!-- E.g. related GitLab issues/MRs -->
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