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Add the correct spellings to the allowed-words list, and put
suggestion-level substitutions in the correct substitutions file.

Update the word admin to administrator and
similar, as needed.

  - Change `max_import_size` from 50 to 0 so it is unlimited,
    instead of being too big of a restriction by default

The notation we use to represent a note is:

```
NOTE: **Note:**
This is a note
```

This is rendered by Nanoc and presented in an alert box in the docs
site. The second `**Note:**` can be redundant, so let's remove it.

The previous URL had two drawbacks:

1. It didn't match what the title was about (`Assignments to DevOps
   Stages and Groups`, and the anchor was `#designated-technical-writers`).
2. It didn't account for the other sections, like development and API
   guidelines.

Use introduced-in lines and cues from page contents to suggest
stage and group ownership for some API docs pages.

Add additional none/unassigned metadata to docs

Closes #216938

Also Standardize quote usage & replace look-alike PRIVATE-TOKENs

Make sure change codeblock fence languages from text
to plaintext, yml to yaml

Also add the backward compatibility definition on the documentation.

We want to be able to export group data from the UI like we currently
can with projects. Update the Group settings page to have link to
export the group data and then download it.

Add documentation describing how to complete this process from the UI.

Relates to issue: #211805

The code blocks for each API call on these pages did not specify a
code style. Most needed to be plaintext, but I also found a couple
of places that had extra line breaks that weren't needed.

A couple needed to be 'shell.'

- Add POST '/groups/import' API endpoint
- Triggers Group Import functionality similar to Project Import
- Imports a group structure along with it's relations