Change shared runner to instance runner

What does this MR do?

Updates usage of 'shared runner' to 'instance runner', as per this decision.

Related issues

• Replace UI usages of shared runner with instanc... (!143480 - merged)
• Update shared runner to instance runner (gitlab-runner#37340 - closed)

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added Technical Writing devopsverify docsimprovement documentation grouprunner maintenancerefactor typemaintenance labels

assigned to @fneill

added sectionci label

added docs-only label

added 1 commit

• 0f6bcf0c - Updated shared to instance runner

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	3 Warnings
	a177a9fc: Commits that change 30 or more lines across at least 3 files should describe these changes in the commit body. For more information, take a look at our Commit message guidelines.
	1f1c99bf: Commits that change 30 or more lines across at least 3 files should describe these changes in the commit body. For more information, take a look at our Commit message guidelines.
	There were no new or modified feature flag YAML files detected in this MR. If the changes here are already controlled under an existing feature flag, please add the feature flagexists. Otherwise, if you think the changes here don't need to be under a feature flag, please add the label feature flagskipped, and add a short comment about why we skipped the feature flag. For guidance on when to use a feature flag, please see the documentation.

	1 Message
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/administration/pages/index.md (Link to current live version)
• doc/administration/pages/source.md (Link to current live version)
• doc/administration/settings/continuous_integration.md (Link to current live version)
• doc/administration/cicd.md (Link to current live version)
• doc/api/runners.md (Link to current live version)
• doc/ci/caching/index.md (Link to current live version)
• doc/ci/cloud_services/index.md (Link to current live version)
• doc/ci/docker/using_docker_build.md (Link to current live version)
• doc/ci/docker/using_docker_images.md (Link to current live version)
• doc/ci/docker/using_kaniko.md (Link to current live version)
• doc/ci/examples/php.md (Link to current live version)
• doc/ci/interactive_web_terminal/index.md (Link to current live version)
• doc/ci/migration/examples/jenkins-maven.md (Link to current live version)
• doc/ci/migration/circleci.md (Link to current live version)
• doc/ci/migration/github_actions.md (Link to current live version)
• doc/ci/migration/jenkins.md (Link to current live version)
• doc/ci/pipelines/cicd_minutes.md (Link to current live version)
• doc/ci/quick_start/index.md (Link to current live version)
• doc/ci/runners/configure_runners.md (Link to current live version)
• doc/ci/runners/new_creation_workflow.md (Link to current live version)
• doc/ci/runners/runners_scope.md (Link to current live version)
• doc/ci/services/mysql.md (Link to current live version)
• doc/ci/services/postgres.md (Link to current live version)
• doc/ci/services/redis.md (Link to current live version)
• doc/ci/testing/code_quality.md (Link to current live version)
• doc/subscriptions/gitlab_com/index.md (Link to current live version)
• doc/subscriptions/bronze_starter.md (Link to current live version)
• doc/topics/autodevops/requirements.md (Link to current live version)
• doc/tutorials/automate_runner_creation/index.md (Link to current live version)
• doc/user/application_security/container_scanning/index.md (Link to current live version)
• doc/user/application_security/dast/browser/configuration/variables.md (Link to current live version)
• doc/user/gitlab_com/index.md (Link to current live version)
• doc/user/group/access_and_permissions.md (Link to current live version)
• doc/user/packages/container_registry/index.md (Link to current live version)
• doc/user/packages/yarn_repository/index.md (Link to current live version)
• doc/user/project/clusters/cluster_access.md (Link to current live version)
• doc/user/project/pages/introduction.md (Link to current live version)
• doc/user/project/repository/forking_workflow.md (Link to current live version)
• doc/user/project/settings/import_export_troubleshooting.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
• The Technical Writer assigned for that stage and group.
• Documentation workflows for information on when to assign a merge request for review.

Reviewer roulette

Category	Reviewer	Maintainer
backend	@jwanjohi (UTC+3, 3 hours ahead of author)	@bmarjanovic (UTC+1, 1 hour ahead of author)
frontend	@mcavoj (UTC+1, 1 hour ahead of author)	@mrincon (UTC+1, 1 hour ahead of author)

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added 1 commit

• 1f1c99bf - Updated shared instance usage

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added 1 commit

• ff2ec4a3 - Removed outdated screenshot

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added 1 commit

• a177a9fc - Updated shared runner to instance runner

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added 1 commit

• 62919b57 - Typo fixes for instance term

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changed the description

added 1 commit

• 774ffcc5 - Updated ui and docs anchor links

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