Merge pull request #84 from axoflow/fix-bsd-syslog-link

Fix broken RFC3164 link

content/chapter-concepts/concepts-message-structure/concepts-message-bsdsyslog/_index.md

@@ -4,7 +4,7 @@ weight:  100
 ---
 <!-- DISCLAIMER: This file is based on the syslog-ng Open Source Edition documentation https://github.com/balabit/syslog-ng-ose-guides/commit/2f4a52ee61d1ea9ad27cb4f3168b95408fddfdf2 and is used under the terms of The syslog-ng Open Source Edition Documentation License. The file has been modified by Axoflow. -->
 
-This section describes the format of a syslog message, according to the [legacy-syslog or BSD-syslog protocol](https://tools.ietf.org/search/rfc3164). A syslog message consists of the following parts:
+This section describes the format of a syslog message, according to the [legacy-syslog or BSD-syslog protocol](https://datatracker.ietf.org/doc/rfc3164/). A syslog message consists of the following parts:
 
 - [`PRI`]({{< relref "/chapter-concepts/concepts-message-structure/concepts-message-bsdsyslog/concepts-message-bsdsyslog-pri/_index.md" >}})
 - [`HEADER`]({{< relref "/chapter-concepts/concepts-message-structure/concepts-message-bsdsyslog/concepts-message-bsdsyslog-header/_index.md" >}})