UAPI: Remove the objhdr-y export list

Remove the objhdr-y export list as it is no longer used.  genhdr-y should be
used instead.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Dave Jones <davej@redhat.com>
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index ab0a984..ec9ae67 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -45,7 +45,7 @@
 
 	=== 7 Kbuild syntax for exported headers
 		--- 7.1 header-y
-		--- 7.2 objhdr-y
+		--- 7.2 genhdr-y
 		--- 7.3 destination-y
 		--- 7.4 generic-y
 
@@ -1282,15 +1282,15 @@
 
 	Subdirectories are visited before their parent directories.
 
-	--- 7.2 objhdr-y
+	--- 7.2 genhdr-y
 
-	objhdr-y specifies generated files to be exported.
+	genhdr-y specifies generated files to be exported.
 	Generated files are special as they need to be looked
 	up in another directory when doing 'make O=...' builds.
 
 		Example:
 			#include/linux/Kbuild
-			objhdr-y += version.h
+			genhdr-y += version.h
 
 	--- 7.3 destination-y