Rename method and remove unnecessary using.

Author: hiihellox10

mdoc/Mono.Documentation/Updater/Formatters/CSharpFullMemberFormatter.cs

@@ -430,15 +430,15 @@ protected override StringBuilder AppendMethodName (StringBuilder buf, MethodDefi
 
         protected override string GetTypeNullableSymbol(TypeReference type, bool? isNullableType)
         {
-            if (isNullableType.IsTrue() && !IsValueTypeOrPassedByReference(type) && !type.FullName.Equals("System.Void"))
+            if (isNullableType.IsTrue() && !IsValueTypeOrDefineByReference(type) && !type.FullName.Equals("System.Void"))
             {
                 return "?";
             }
 
             return string.Empty;
         }
 
-        private bool IsValueTypeOrPassedByReference(TypeReference type)
+        private bool IsValueTypeOrDefineByReference(TypeReference type)
         {
             if (type.IsValueType)
             {

mdoc/mdoc.Test/mdoc.Test.NullableReferenceTypes/mdoc.Test.NullableReferenceTypes/MethodParameter.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
 
 namespace mdoc.Test.NullableReferenceTypes
 {