overview.md some links fixed

Author: michal-at-travisci

user/reference/overview.md

@@ -215,23 +215,22 @@ sudo docker run --privileged --rm -t -v /sys/kernel/debug:/sys/kernel/debug:rw
 
 would result in an error.
 
-Also have a look at the [Github issue relevant to the topic](https://github.com/lxc/lxd/issues/2661) and the [LXD apparmor setup](https://github.com/lxc/lxd/blob/master/lxd/apparmor/apparmor.go) for more details.
+Also have a look at the [Github issue relevant to the topic](https://github.com/canonical/lxd/issues/2661) and the [LXD apparmor setup](https://github.com/canonical/lxd/blob/main/lxd/apparmor/apparmor.go) for more details.
 
 #### System Calls Interception
 
 If you run into a message like:
 
 > System doesn't support syscall interception
 
-It most probably means a system call interception is outside of the list of the ones considered to be safe (LXD can allow system call interception [if it's considered to be safe](https://github.com/lxc/lxd/blob/master/doc/syscall-interception.md)). 
+It most probably means a system call interception is outside of the list of the ones considered to be safe (LXD can allow system call interception [if it's considered to be safe](https://github.com/canonical/lxd/blob/main/doc/syscall-interception.md)). 
 
 ### Linux: Hugepages Support from within LXD Container
 
 As of now, Travis CI is not configured to allow hugepages within unprivileged containers. This may change on short notice.
 
 The unprivileged containers access to hugepages is added by the great Linux and LXD teams. To understand what needs to be addressed in order to avoid memory issues with LXD containers, please look at the resources below:
 * [LXD 3.22 release notes](https://discuss.linuxcontainers.org/t/lxd-3-22-has-been-released/7027)
-* [LXD configuration](https://linuxcontainers.org/lxd/docs/master/instances#hugepage-limits-via-limitshugepagessize)
 
 
 ## VM Instance Size