Update ioctl.html

Fix file descriptor reference.

Author: Zachary Lebold

man/syscall/ioctl.html

@@ -57,7 +57,7 @@ <h3>Synopsis</h3>
 <h3>Description</h3>
 <p>
 <tt>ioctl</tt> performs an object-specific operation <em>code</em> on
-the object referred to by the file handle <em>fd</em>. The
+the object referred to by the file descriptor <em>fd</em>. The
 <em>data</em> argument may point to supplemental data required or
 returned by the operation. The size of buffer required, if any, and
 other such matters are operation-specific.