[PATCH] Documentation: Mention scripts/diffconfig as a tool to compare config files

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The kconfig documentation suggests using plain 'diff' to compare
config files and then adds "Yes, we need something better here".
"a717417 kconfig: add diffconfig utility" added what that comment was
looking for.

Signed-off-by: Javi Merino <javi.merino@xxxxxxx>
---
 Documentation/kbuild/kconfig.txt |    8 +++-----
 1 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/Documentation/kbuild/kconfig.txt b/Documentation/kbuild/kconfig.txt
index c313d71..9d5f2a9 100644
--- a/Documentation/kbuild/kconfig.txt
+++ b/Documentation/kbuild/kconfig.txt
@@ -28,12 +28,10 @@ new (default) values, so you can use:
 
 	grep "(NEW)" conf.new
 
-to see the new config symbols or you can 'diff' the previous and
-new .config files to see the differences:
+to see the new config symbols or you can use diffconfig to see the
+differences between the previous and new .config files:
 
-	diff .config.old .config | less
-
-(Yes, we need something better here.)
+	scripts/diffconfig .config.old .config | less
 
 ______________________________________________________________________
 Environment variables for '*config'
-- 
1.7.0.4


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