Update File.xml (#2559)

Author: SIkebe

xml/System.IO/File.xml

@@ -5356,7 +5356,7 @@
         <exception cref="T:System.ArgumentException">
           <paramref name="path" /> is a zero-length string, contains only white space, or contains one or more invalid characters as defined by <see cref="F:System.IO.Path.InvalidPathChars" />.</exception>
         <exception cref="T:System.ArgumentNullException">
-          <paramref name="path" /> is <see langword="null" /> or <paramref name="contents" /> is empty.</exception>
+          <paramref name="path" /> is <see langword="null" />.</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.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
@@ -5446,7 +5446,7 @@
         <exception cref="T:System.ArgumentException">
           <paramref name="path" /> is a zero-length string, contains only white space, or contains one or more invalid characters as defined by <see cref="F:System.IO.Path.InvalidPathChars" />.</exception>
         <exception cref="T:System.ArgumentNullException">
-          <paramref name="path" /> is <see langword="null" /> or <paramref name="contents" /> is empty.</exception>
+          <paramref name="path" /> is <see langword="null" />.</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.IO.DirectoryNotFoundException">The specified path is invalid (for example, it is on an unmapped drive).</exception>
         <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>