lguest: fix paths in comments

After commit 07fe9977, lguest tool has already moved from
Documentation/virtual/lguest/ to tools/lguest/.
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/Kconfig

@@ -5,10 +5,9 @@ config LGUEST
 	---help---
 	  This is a very simple module which allows you to run
 	  multiple instances of the same Linux kernel, using the
-	  "lguest" command found in the Documentation/virtual/lguest
-	  directory.
+	  "lguest" command found in the tools/lguest directory.
 
 	  Note that "lguest" is pronounced to rhyme with "fell quest",
-	  not "rustyvisor". See Documentation/virtual/lguest/lguest.txt.
+	  not "rustyvisor". See tools/lguest/lguest.txt.
 
 	  If unsure, say N.  If curious, say M.  If masochistic, say Y.

tools/lguest/lguest.txt

@@ -70,7 +70,7 @@ Running Lguest:
 
 - Run an lguest as root:
 
-      Documentation/virtual/lguest/lguest 64 vmlinux --tunnet=192.168.19.1 \
+      tools/lguest/lguest 64 vmlinux --tunnet=192.168.19.1 \
         --block=rootfile root=/dev/vda
 
    Explanation: