Freshness update: Routing to controller actions (#36808)

* Initial plan

* Update routing.md frontmatter: add ai-usage, update ms.date

Co-authored-by: meaghanlewis <10103121+meaghanlewis@users.noreply.github.com>

* Apply suggested edits from Learn Authoring Assistant

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: meaghanlewis <10103121+meaghanlewis@users.noreply.github.com>
Co-authored-by: Meaghan Osagie <mosagie@microsoft.com>

Author: Copilot