Update method-parameters.md (#42684)

* Update method-parameters.md

In a sample code, when I pass a value type by reference, if the method assigns the parameter to refer to a different object, those changes are visible from the caller.

* Update docs/csharp/language-reference/keywords/method-parameters.md

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Co-authored-by: Bill Wagner <wiwagn@microsoft.com>

docs/csharp/language-reference/keywords/method-parameters.md

@@ -35,7 +35,7 @@ How an argument is passed, and whether it's a reference type or value type contr
   - If the method assigns the parameter to refer to a different object, those changes **aren't** visible from the caller.
   - If the method modifies the state of the object referred to by the parameter, those changes **are** visible from the caller.
 - When you pass a *value* type *by reference*:
-  - If the method assigns the parameter to refer to a different object, those changes **aren't** visible from the caller.
+  - If the method assigns the parameter to refer to a different object using `ref =`, those changes **aren't** visible from the caller.
   - If the method modifies the state of the object referred to by the parameter, those changes **are** visible from the caller.
 - When you pass a *reference* type *by reference*:
   - If the method assigns the parameter to refer to a different object, those changes **are** visible from the caller.