[PATCH] doc/develop/distro.rst: Better document upstream locations of extlinux.conf

[Tom Rini]

First, the "Boot Loader Specification" link has moved to a new location,
so link to that directly. Second, that link does not document as much of
the extlinux.conf format as I recall the old version doing at least.
However, the Syslinux Wiki is the current location of the documentation
linked to in doc/README.pxe and so add a link to that wiki as well.

Signed-off-by: Tom Rini <trini at konsulko.com>
---
 doc/develop/distro.rst | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/doc/develop/distro.rst b/doc/develop/distro.rst
index 637bc27fc2d7..d80c2eff6192 100644
--- a/doc/develop/distro.rst
+++ b/doc/develop/distro.rst
@@ -68,7 +68,8 @@ Boot Configuration Files
 
 The standard format for boot configuration files is that of extlinux.conf, as
 handled by U-Boot's "syslinux" (disk) or "pxe boot" (network). This is roughly
-as specified at `Boot Loader Specification`_:
+as specified at `Boot Loader Specification`_ and more completely at `The
+Syslinux Wiki`_:
 
 
 ... with the exceptions that the Boot Loader Specification document:
@@ -440,7 +441,8 @@ way in future u-boot versions.  In particular the <device type>_boot
 variables (e.g. mmc_boot, usb_boot) are a strictly internal implementation
 detail and must not be used as a public interface.
 
-.. _`Boot Loader Specification`: https://systemd.io/BOOT_LOADER_SPECIFICATION/
+.. _`Boot Loader Specification`: https://uapi-group.org/specifications/specs/boot_loader_specification/
+.. _`The Syslinux Wiki`: https://wiki.syslinux.org/wiki/index.php?title=PXELINUX
 
 .. sectionauthor:: (C) Copyright 2014 Red Hat Inc.
 .. sectionauthor:: Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
-- 
2.43.0