We are moving to main by default, so we need to
update the docs to match.

Variable docs moves to pipeline authoring, code quality
moves to static analysis, and artifacts docs moves to
testing.

The Continuous Integratin group was renamed as
Pipeline Execution.

https://mywiki.wooledge.org/Quotes

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/58200

Make sure environment variables are referred to as
CI/CD variables or environment variables, as needed

We should talk about CI/CD variables, not environment
variables, when talking about variables used in CI/CD

Name them CI/CD variables, not environment variables,
for clarity and consistency. It avoids them being confused
with the environments feature, or build/job environments.

We need information in various pages about
prefilled variables, and crosslink them together

For the new tier name changes
https://gitlab.com/gitlab-org/technical-writing/-/issues/344

Simplify settings text as part of OKR work.
Reorders the settings to make settings easier
to read, adds one more docs link, and moves
coverage regex examples into the docs.

Continuing the process of cleaning up our documentation and building
a spelling-exceptions file.

Remove enabled by default feature flag for restricting
access to build debug mode.

- Introduce restrict_user_defined_variables project setting
  and allow it to be set via API.
- Define policy for user defined variables.
- Inject user-defined variables consistently throughout
  the codebase.
- Allow user-defined variables to be set only by maintainers
  if the project setting is enabled.
- Allow passing variables from parent to child pipeline

To avoid any confusion about whether the regex tests for complete or
just partial equality.

GitLab should not be used with apostrophe s

Keep users from viewing job traces if they are not developers on the
project and the job is using the env variable CI_DEBUG_TRACE=true

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.

In https://gitlab.com/groups/gitlab-org/-/epics/5020, we decided to
use only two alerts (note, warning), and eliminate any bold text
coming after the icon.

This changes CAUTION to WARNING and eliminates any
**Warning:**/**Caution:** text that comes after them.

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.

Closes: https://gitlab.com/gitlab-org/gitlab/-/issues/222328

Many notes can be just regular text, or sometimes
removed completely or altered.