Updating metadata for maintainers

Because any maintainer can merge
Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/397788

doc/development/adding_service_component.md

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 # Adding a new Service Component to GitLab

doc/development/ai_architecture.md

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 ---
 
 # AI Architecture

doc/development/api_graphql_styleguide.md

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+info: Any user with at least the Maintainer role can merge updates to this content. For details, see https://docs.gitlab.com/ee/development/development_processes.html#development-guidelines-review.
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 # GraphQL API style guide

doc/development/api_styleguide.md

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 # API style guide

doc/development/application_secrets.md

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 # Application secrets

doc/development/architecture.md

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 # GitLab architecture overview

doc/development/backend/ruby_style_guide.md

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 type: reference, dev
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+info: Any user with at least the Maintainer role can merge updates to this content. For details, see https://docs.gitlab.com/ee/development/development_processes.html#development-guidelines-review.
 ---
 
 # Ruby style guide

doc/development/bitbucket_cloud_importer.md

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 # Bitbucket Cloud importer developer documentation

doc/development/caching.md

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 # Caching guidelines

doc/development/changelog.md

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 # Changelog entries

doc/development/chaos_endpoints.md

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 # Generating chaos in a test GitLab instance

doc/development/code_comments.md

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 # Code comments

doc/development/code_review.md

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 # Code Review Guidelines

doc/development/contributing/design.md

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 type: reference, dev
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 # Design and user interface changes

doc/development/contributing/first_contribution.md

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 # Tutorial: Make a GitLab contribution

doc/development/contributing/index.md

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 # Contribute to GitLab development

doc/development/contributing/issue_workflow.md

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 type: reference, dev
 stage: none
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 # Issues workflow

doc/development/contributing/merge_request_workflow.md

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 type: reference, dev
 stage: none
 group: unassigned
-info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
+info: Any user with at least the Maintainer role can merge updates to this content. For details, see https://docs.gitlab.com/ee/development/development_processes.html#development-guidelines-review.
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 # Merge requests workflow

doc/development/contributing/style_guides.md

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 type: reference, dev
 stage: none
 group: unassigned
-info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/product/ux/technical-writing/#assignments
+info: Any user with at least the Maintainer role can merge updates to this content. For details, see https://docs.gitlab.com/ee/development/development_processes.html#development-guidelines-review.
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 # Development style guides

doc/development/dangerbot.md

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 ---
 
 # Danger bot