Merge pull request #2054 from Priya91/updateOSPlatform

Update string values in OSPlatform.

Author: stephentoub

src/System.Runtime.InteropServices.RuntimeInformation/src/OSPlatform.cs

@@ -41,8 +41,8 @@ public static OSPlatform OSX
 
         private OSPlatform(string osPlatform)
         {
-            if (osPlatform == null) throw new ArgumentNullException("name");
-            if (osPlatform.Length == 0) throw new ArgumentException(SR.Argument_EmptyValue, "name");
+            if (osPlatform == null) throw new ArgumentNullException("osPlatform");
+            if (osPlatform.Length == 0) throw new ArgumentException(SR.Argument_EmptyValue, "osPlatform");
 
             _osPlatform = osPlatform;
         }