Make docs about expect_next_instance_of consistent

See merge request gitlab-org/gitlab-ce!23507

Approximate table counts based on TABLESAMPLE

See merge request gitlab-org/gitlab-ce!22650

Fix lack of documentation on how to fetch a snippet's content using API

See merge request gitlab-org/gitlab-ce!23448

Fix documentation for /api/v4/projects/:id/repository/archive

Closes #45992

See merge request gitlab-org/gitlab-ce!23501

Rollback will not work because Envoy will still fetch latest commit from the…

See merge request gitlab-org/gitlab-ce!23493

Docs : Auto Devops migrate: add two release info

See merge request gitlab-org/gitlab-ce!23500

[ci skip]

The numbers in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22650#note_117645395
are quite promising with that target.

This improves readability quite a bit.

A tablesample count executes in two phases:
* Estimate table sizes based on reltuples.
* Based on the estimate:
  * If the table is considered 'small', execute an exact relation count.
  * Otherwise, count on a sample of the table using TABLESAMPLE.

The size of the sample is chosen in a way that we always roughly scan
the same amount of rows (see TABLESAMPLE_ROW_TARGET).

The goal is to reflect separation of concern also in specs.

Fix line height of numbers in file blame view.

Closes #54048

See merge request gitlab-org/gitlab-ce!23090

Fix "protected branches only" checkbox not set properly at init

Closes #53515

See merge request gitlab-org/gitlab-ce!23409

The documentation mistakenly says that `format` can be used as a
parameter, but the Grape middleware reserves `format` as a content-type
header. Update the documentation to make it explicit the suffix
should be used to specify a format.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/45992

Resolve "Filter by `None`/`Any` for labels in issues/mrs/boards"

Closes #52370

See merge request gitlab-org/gitlab-ce!23111

Fix deprecation: render :text is deprecated because it does not actually render…

See merge request gitlab-org/gitlab-ce!23425

Resolve "unstar icon button is misaligned"

Closes #53400

See merge request gitlab-org/gitlab-ce!23444

The `only_protected_branches` value was being enabled by default
even though the checkbox was default off. In EE, this wasn't a
problem because there was EE-specific code to update the
entire form.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/53515

Fixes tooltip overflowing in mini pipeline

Closes #54514

See merge request gitlab-org/gitlab-ce!23486

Fix secondary nav dropdown menu styling in tablet and mobile screens

Closes #54648

See merge request gitlab-org/gitlab-ce!23446

Update Dependency Scanning report fixtures

See merge request gitlab-org/gitlab-ce!23460

Update CONTRIBUTING.md: style guide link

See merge request gitlab-org/gitlab-ce!23481

So we compare `expect_any_instance_of` with
`expect_next_instance_of`, but still mention
`allow_any_instance_of`.