Docs style guide proposals mpenna20190906 port

See merge request gitlab-org/gitlab!17862

Improve grammar and links in various docs

Closes #33850

See merge request gitlab-org/gitlab!18430

After review, minor improvements to docs
from suggestions

Merge branch 'docs-33656-add-rails-console-commands-for-deleting-sidekiq-jobs-to-troubleshooting-page' into 'master'

Docs: Add examples for deleting sidekiq jobs

Closes #33656

See merge request gitlab-org/gitlab!18301

Extract shared docker code into a base class

See merge request gitlab-org/gitlab!18306

Refactor shared docker code to make it more maintainable and easier
to add new services

Enable frozen string for spec/validators

See merge request gitlab-org/gitlab!18367

Fix typo in Praefect section

See merge request gitlab-org/gitlab!18413

Remove fe components

See merge request gitlab-org/gitlab!17131

Fix N+1 queries in Jira Development Panel API endpoint

See merge request gitlab-org/gitlab!18329

Add end-to-end test for creating a group issue board via the GUI

See merge request gitlab-org/gitlab!18474

Remove needs dependency for .qa-job-base

Closes #33862

See merge request gitlab-org/gitlab!18460

Closes https://gitlab.com/gitlab-org/gitlab/issues/33862

Add current state of 50k architecture to docs

See merge request gitlab-org/gitlab!18484

Add current state of 25k architecture to the docs

See merge request gitlab-org/gitlab!18360

Remove models from parameterized test

Closes #33908

See merge request gitlab-org/gitlab!18473

Create allow_next_instance_of spec helper

Closes #25470

See merge request gitlab-org/gitlab!18139

Limit the number of comments on a noteable

See merge request gitlab-org/gitlab!18111

Now issue boards hide redundant labels so the removed expectation
makes no sense anymore. Actually, due to this expectation this test
is failing on master.

This is not really related to what this MR intends to do, which is
to create a new e2e tests, but since I found it while creating this
new test, I thought it would make sense to fix it here.

There was some duplication in the show page object of group and
project issue boards, so now this is a component that can be used
by both group and project issue boards since they share the same
elements and methods.

Also, update the affected tests accordingly.

Fixes broken master

Propose and document a location for running chatops commands

See merge request gitlab-org/gitlab!18229

Document which slack chat rooms to run feature flag chatops commands
in for gitlab employees working on gitlab.com as well as staging and dev
environments

Update docs linting details

Closes #24079

See merge request gitlab-org/gitlab!18174

# Conflicts:
#   doc/development/fe_guide/components.md

Documentation for Conan Package registry

See merge request gitlab-org/gitlab!16349

Docs describing the initial MVC behavior of the GitLab
conan package repository.

This incluses functions for upload, install, search, info,
and remove.

Fix minor grammar issue for time tracking docs

Closes #33869

See merge request gitlab-org/gitlab!18441

Fix diverged from upstream detection with pull_mirror_branch_prefix

See merge request gitlab-org/gitlab!18069

Refactor processing of ref changes in PostReceive

See merge request gitlab-org/gitlab!18310

Improve help pages with documentation

See merge request gitlab-org/gitlab!18331

Internal ids: Fix regression with multiple IID scopes

See merge request gitlab-org/gitlab!18344

For models with multiple iid scopes (Milestone), the flag
`@internal_id_needs_tracking` should only be reset if the tracking was
actually done.

Most likely introduced by the refactoring in
https://gitlab.com/gitlab-org/gitlab/merge_requests/18003