Update documentation links

Author: Vlad Mihai

docs/executors/custom_examples/libvirt.md

@@ -25,7 +25,7 @@ comes with when installing libvirt so make sure it's running.
 This driver requires bridge networking since each VM needs to have
 it's own dedicated IP address so GitLab Runner can SSH inside of it to
 run commands. An SSH key can be generated
-[using the following commands](https://docs.gitlab.com/ee/user/ssh.html#generating-a-new-ssh-key-pair).
+[using the following commands](https://docs.gitlab.com/ee/user/ssh.html#generate-an-ssh-key-pair).
 
 A base disk VM image is created so that dependencies are not downloaded
 every build. In the following example,

docs/register/index.md

@@ -298,7 +298,7 @@ has been changed in GitLab or when the user did not correctly enter the registra
 
 When this error occurs, the first step is to ask a GitLab administrator to verify that the registration token is valid.
 
-Additionally, confirm that runner registration in the project or group is [allowed](https://docs.gitlab.com/ee/user/admin_area/settings/continuous_integration.html#restrict-runner-registration-by-all-members-in-a-group) by the GitLab administrator.
+Additionally, confirm that runner registration in the project or group is [allowed](https://docs.gitlab.com/ee/administration/settings/continuous_integration.html#restrict-runner-registration-by-all-members-in-a-group) by the GitLab administrator.
 
 ## `[[runners]]` configuration template file