mock: simpler deprecation doc for AnythingOfTypeArgument

Co-authored-by: Bracken <abdawson@gmail.com>

mock/mock.go

@@ -766,25 +766,15 @@ const (
 // AnythingOfTypeArgument contains the type of an argument
 // for use when type checking.  Used in Diff and Assert.
 //
-// Deprecated: this is an implementation detail that must not be used. Use the [AnythingOfType] constructor instead.
+// Deprecated: this is an implementation detail that must not be used. Use the [AnythingOfType] constructor instead, example:
 //
-// If AnythingOfTypeArgument is used as a function return value type you can usually replace
-// the function with a variable. Example:
+//	m.On("Do", mock.AnythingOfType("string"))
 //
-//	func anyString() mock.AnythingOfTypeArgument {
-//	    return mock.AnythingOfType("string")
-//	}
-//
-// Can be replaced by:
+// All explicit type declarations can be replaced with interface{} as is expected by [Mock.On], example:
 //
-//	func anyString() interface{} {
-//	    return mock.IsType("")
+//	func anyString interface{} {
+//		return mock.AnythingOfType("string")
 //	}
-//
-// It could even be replaced with a variable:
-//
-//	var anyString = mock.AnythingOfType("string")
-//	var anyString = mock.IsType("") // alternative
 type AnythingOfTypeArgument = anythingOfTypeArgument
 
 // anythingOfTypeArgument is a string that contains the type of an argument