kbuild: move autoconf.h to include/generated

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/Documentation/kbuild/kconfig.txt b/Documentation/kbuild/kconfig.txt
index 849b5e5..ab8dc35 100644
--- a/Documentation/kbuild/kconfig.txt
+++ b/Documentation/kbuild/kconfig.txt
@@ -106,7 +106,8 @@
 KCONFIG_AUTOHEADER
 --------------------------------------------------
 This environment variable can be set to specify the path & name of the
-"autoconf.h" (header) file.  Its default value is "include/linux/autoconf.h".
+"autoconf.h" (header) file.
+Its default value is "include/generated/autoconf.h".
 
 
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