Fix grammatical error in method parameters documentation

[NoahS2003]

Corrected the phrase "it's own value" to "its own value" for grammatical accuracy.

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Internal previews

📄 File	🔗 Preview link
docs/csharp/language-reference/keywords/method-parameters.md	Method parameters and modifiers
docs/csharp/language-reference/operators/assignment-operator.md	"Assignment operators - assign an expression to a variable"

[Copilot]

Pull request overview

This PR fixes a grammatical error in the C# method parameters documentation by correcting the possessive pronoun from "it's" (contraction of "it is") to "its" (possessive form).

Key Change:

• Corrected "it's own value" to "its own value" in the reference variable explanation

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[NoahS2003]

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[BillWagner]

Thanks @NoahS2003

This LGTM, and I'll now.