x86: Update docs link in bootparam header

After Linux commit ff61f0791ce9, x86 documentation was moved to
arch/x86 and the link in bootparam.h was broken.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index ea816ca..ac48653 100644
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -62,7 +62,7 @@
 /**
  * struct setup_header - Information needed by Linux to boot
  *
- * See https://www.kernel.org/doc/html/latest/x86/boot.html
+ * See https://www.kernel.org/doc/html/latest/arch/x86/boot.html
  */
 struct setup_header {
 	__u8	setup_sects;