As part of the spelling test being developed in another issue,
fix some of the identified spelling issues.

- Also fixed errors in `doc/administration`

Find and replace sh with shell

As we now support replication from Object Storage

This changes any mention of gitlab-ce to gitlab-foss, and any mention of
gitlab-ee to just gitlab.

Remove unneeded trailing whitespace in lines in
/development /ci /api and /administration docs.

Previously, we used brackets to denote the tier badges,
but this made Kramdown, the docs site Markdown renderer,
show many warnings when building the site. This is now
fixed by using parentheses instead of square brackets.

This was caused by [PREMIUM] looking like a link to
Kramdown, which couldn't find a URL there.

See:
- https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/484
- https://gitlab.com/gitlab-org/gitlab-ce/issues/63800

Spacing following lists should be 2 spaces, and 3 for numbered lists

Long snippets were difficult to read and the text to replace was
sometimes off the screen. This updates the snippets to be multiline.

In addition, the code snippets were changed to use alligator brackets
to indicate the text that requires changing.