mount_nfs(8) correction

[Rich Neswold <rich.neswold%gmail.com@localhost>]

Index: sbin/mount_nfs/mount_nfs.8
==================================================================
--- sbin/mount_nfs/mount_nfs.8
+++ sbin/mount_nfs/mount_nfs.8
@@ -366,11 +366,11 @@
 when mounting servers that do not support
 .Tn TCP
 mounts.
 .It Fl X
 Perform 32 \*[Lt]-\*[Gt] 64 bit directory cookie translation for
version 3 mounts.
-This may be need in the case of a server using the upper 32 bits of
+This may be needed in the case of a server using the upper 32 bits of
 version 3 directory cookies, and when you are running emulated binaries
 that access such a filesystem.
 Native
 .Nx
 binaries will never need this option.