Merge pull request #14354 from poettering/link-fix

two trivial doc fixes

.github/ISSUE_TEMPLATE/Bug_report.md

@@ -8,7 +8,7 @@ about: A report of an error in a recent systemd version
 > ...
 
 <!-- **NOTE:** Do not submit bug reports about anything but the two most recently released systemd versions upstream! -->
-<!-- For older version please use distribution trackers (see https://github.com/systemd/systemd/blob/master/docs/CONTRIBUTING.md#filing-issues). -->
+<!-- For older version please use distribution trackers (see https://systemd.io/CONTRIBUTING#filing-issues). -->
 
 **Used distribution**
  > …