Fix FileSystemInfo.Attributes exceptions (#3409)

The access denied exception has changed from ArgumentException on .NET Framework to UnauthorizedAccessException on .NET Core. See CoreFx issue #42076.

Author: mriehm

xml/System.IO/FileSystemInfo.xml

@@ -274,11 +274,13 @@
         <exception cref="T:System.IO.FileNotFoundException">The specified file doesn't exist. Only thrown when setting the property value.</exception>
         <exception cref="T:System.IO.DirectoryNotFoundException">The specified path is invalid. For example, it's on an unmapped drive. Only thrown when setting the property value.</exception>
         <exception cref="T:System.Security.SecurityException">The caller doesn't have the required permission.</exception>
+        <exception cref="T:System.UnauthorizedAccessException">.NET Core only: The user attempts to set an attribute value but doesn't have write permission.</exception>
+        <exception cref="T:System.IO.PathTooLongException">The specified path, file name, or both exceed the system-defined maximum length.</exception>
         <exception cref="T:System.ArgumentException">The caller attempts to set an invalid file attribute.  
 
  -or-  
 
- The user attempts to set an attribute value but doesn't have write permission.</exception>
+ .NET Framework only: The user attempts to set an attribute value but doesn't have write permission.</exception>
         <exception cref="T:System.IO.IOException">
           <see cref="M:System.IO.FileSystemInfo.Refresh" /> cannot initialize the data.</exception>
         <permission cref="T:System.Security.Permissions.FileIOPermission">for writing files and directories. Associated enumeration: <see cref="F:System.Security.Permissions.FileIOPermissionAccess.Write" /> Security action: <see cref="F:System.Security.Permissions.SecurityAction.Demand" /></permission>