Remove Redundant Resource entry (#15928)

Author: tarekgh

src/mscorlib/Resources/Strings.resx

@@ -2866,9 +2866,6 @@
   <data name="Marshaler_StringTooLong" xml:space="preserve">
     <value>Marshaler restriction: Excessively long string.</value>
   </data>
-  <data name="MemoryDisposed" xml:space="preserve">
-    <value>Memory&lt;T&gt; has been disposed.</value>
-  </data>
   <data name="MissingConstructor_Name" xml:space="preserve">
     <value>Constructor on type '{0}' not found.</value>
   </data>
@@ -3688,7 +3685,7 @@
   <data name="NotSupported_SignatureType" xml:space="preserve">
     <value>This method is not supported on signature types.</value>
   </data>
-  <data name="Memory_ThrowIfDisposed" xml:space="preserve">
+  <data name="MemoryDisposed" xml:space="preserve">
     <value>Memory&lt;T&gt; has been disposed.</value>
   </data>
   <data name="Memory_OutstandingReferences" xml:space="preserve">

src/mscorlib/src/System/ThrowHelper.cs

@@ -563,7 +563,7 @@ internal enum ExceptionResource
         TaskT_TransitionToFinal_AlreadyCompleted,
         TaskCompletionSourceT_TrySetException_NullException,
         TaskCompletionSourceT_TrySetException_NoExceptions,
-        Memory_ThrowIfDisposed,
+        MemoryDisposed,
         Memory_OutstandingReferences,
         InvalidOperation_WrongAsyncResultOrEndCalledMultiple,
         ConcurrentDictionary_ConcurrencyLevelMustBePositive,
@@ -580,7 +580,6 @@ internal enum ExceptionResource
         InvalidOperation_HandleIsNotInitialized,
         AsyncMethodBuilder_InstanceNotInitialized,
         ArgumentNull_SafeHandle,
-        MemoryDisposed,
     }
 }