Doc: nfs: Fix typos in Documentation/filesystems/nfs

This patch fix spelling typos found in Documentation/filesystems/nfs

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/filesystems/nfs/nfsroot.txt

@@ -166,7 +166,7 @@ ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:
 		Value gets exported by /proc/net/pnp which is often linked
 		on embedded systems by /etc/resolv.conf.
 
-  <dns1-ip>	IP address of secound nameserver.
+  <dns1-ip>	IP address of second nameserver.
 		Same as above.