Freshness pass: Introduction to .NET

[Copilot]

Applies Microsoft Style Guide pass to docs/core/introduction.md — stale date, first-person "our", passive constructions, weak phrasing, and inconsistent dash usage.

Changes

• Frontmatter: ms.date → 03/10/2026; added ai-usage: ai-assisted
• Voice/passives: "runtime that is used in production" → "runtime used in production"; "due to using a GC" → "because it uses a GC"
• Contractions: "It is type-safe" → "It's"; "It is updated monthly" → "It's"
• First-person removed: "per our [releases and support policies]" → "per the …"
• Weak constructions: "There are multiple variants … The reason … is part historical, part technical" → single sentence: "Multiple variants of .NET exist, each supporting a different type of app for both historical and technical reasons."
• Word choice: "Additional licenses" → "Other"; "additional manual optimizations" → "more"; "being able to build, analyze, and test" → "building, analyzing, and testing"
• Punctuation: All -- list separators (Components + .NET implementations) replaced with em-dashes —

Contributes to #51732

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Internal previews

📄 File	🔗 Preview link
docs/core/introduction.md	Introduction to .NET

[Copilot]

Pull request overview

Applies a Microsoft Style Guide pass to refresh docs/core/introduction.md by updating metadata and improving clarity/voice consistency.

Changes:

• Updated frontmatter metadata (including ms.date) and added ai-usage.
• Refined wording to reduce passives/weak phrasing and removed first-person language.
• Normalized punctuation by replacing -- with em dashes — in lists.

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