Deprecate CA1801 in favor of IDE0060 (#21882)

Author: Evangelink

docs/fundamentals/code-analysis/quality-rules/ca1801.md

@@ -45,6 +45,9 @@ This rule does not examine the following kinds of methods:
 
 This rule does not flag parameters that are named with the [discard](../../../csharp/discards.md) symbol, for example, `_`, `_1`, and `_2`. This reduces warning noise on parameters that are needed for signature requirements, for example, a method used as a delegate, a parameter with special attributes, or a parameter whose value is implicitly accessed at run time by a framework but is not referenced in code.
 
+> [!NOTE]
+> This rule has been deprecated in favor of [IDE0060](../style-rules/ide0060.md). For information about how to enforce the IDE0060 analyzer at build, see [code-style analysis](../overview.md#code-style-analysis).
+
 ## Rule description
 
 Review parameters in non-virtual methods that are not used in the method body to make sure no incorrectness exists around failure to access them. Unused parameters incur maintenance and performance costs.