Fix typo in help text.

This was reported by r.phillips@jkmrc.com on dhcp-users.
I manually edited configure instead of running autoconf.

configure

@@ -860,7 +860,7 @@ Optional Features:
   --enable-delayed-ack    queues multiple DHCPACK replies (default is no)
   --enable-dhcpv6         enable support for DHCPv6 (default is yes)
   --enable-paranoia       enable support for chroot/setuid (default is no)
-  --eanble-early-chroot   enable chrooting prior to configuration (default is
+  --enable-early-chroot   enable chrooting prior to configuration (default is
                           no)
 
 Optional Packages:

configure.ac

@@ -115,7 +115,7 @@ AC_ARG_ENABLE(paranoia,
 	AC_HELP_STRING([--enable-paranoia],
 		[enable support for chroot/setuid (default is no)]))
 AC_ARG_ENABLE(early_chroot,
-	AC_HELP_STRING([--eanble-early-chroot],
+	AC_HELP_STRING([--enable-early-chroot],
 		[enable chrooting prior to configuration (default is no)]))
 # If someone enables early chroot, but does not enable paranoia, do so for
 # them.