Doc/mb/ocp: Add hyperlink to src/mainboard/ocp/deltalake/vpd.h

It would be easier for people to find the defined variables.

Change-Id: I6d181f6602aa5d55019ea2110b2d8e1fa7e0159c
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57255
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
diff --git a/Documentation/mainboard/ocp/deltalake.md b/Documentation/mainboard/ocp/deltalake.md
index b85f8ce..4510866 100644
--- a/Documentation/mainboard/ocp/deltalake.md
+++ b/Documentation/mainboard/ocp/deltalake.md
@@ -63,7 +63,7 @@
 - systemboot_log_level: u-root package systemboot log levels, would be mapped to
   quiet/verbose in systemboot as that is all we have for now. 5 to 8 would be
   mapped to verbose, 0 to 4 and 9 would be mapped to quiet.
-- VPDs affecting coreboot are listed/documented in src/mainboard/ocp/deltalake/vpd.h.
+- VPDs affecting coreboot are listed/documented in [src/mainboard/ocp/deltalake/vpd.h].
 
 ## Working features
 The solution is developed using LinuxBoot payload with Linux kernel 5.2.9,
@@ -179,3 +179,4 @@
 [All about u-root]: https://github.com/linuxboot/book/tree/master/u-root
 [u-root]: https://u-root.org/
 [ChromeOS VPD]: https://chromium.googlesource.com/chromiumos/platform/vpd/+/master/README.md
+[src/mainboard/ocp/deltalake/vpd.h]: https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/heads/master/src/mainboard/ocp/deltalake/vpd.h