src, util: Clean up makefile.inc in text, help & comments

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ib69236fb5d68272f92405512dc231fa75ecccaa6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80125
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/Kconfig b/src/Kconfig
index 21c50c5..2bcc3ce 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -1492,7 +1492,7 @@
 	  This variable allows SoC/mainboard to supply in a custom linker file
 	  if required. This determines the linker file used for all the stages
 	  (bootblock, romstage, verstage, ramstage, postcar) in
-	  src/arch/${ARCH}/Makefile.inc.
+	  src/arch/${ARCH}/Makefile.mk.
 
 ###############################################################################
 # Set default values for symbols created before mainboards.  This allows the