Freshness update: Routing to controller actions

[Copilot]

Freshness review of aspnetcore/mvc/controllers/routing.md. Content updates improve clarity, readability, and consistency. The changes focus on making explanations more concise, updating terminology, and enhancing guidance for developers using routing in ASP.NET Core MVC.

Changes

• ms.date: Updated from 04/08/2022 → 02/25/2026
• ai-usage: ai-assisted: Added per convention (AI-assisted review); inserted in correct alphabetical position before author
• Reworded explanations to use clearer and more direct language throughout the document, including updates to descriptions of conventional and attribute routing, route templates, and reserved keywords.
• Updated terminology to use more consistent phrasing such as "runs" instead of "is run," "includes" instead of "has," and clarified the use of default values and optional parameters in route templates.
• Enhanced guidance on route ordering, greedy routes, and reserved keywords to help developers avoid common pitfalls and understand routing behavior more thoroughly.

Contributes to #36100

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