Docs: Fix two anchors in EE docs

doc/administration/geo/replication/external_database.md

@@ -39,7 +39,7 @@ Given you have a primary node set up on AWS EC2 that uses RDS.
 You can now just create a read-only replica in a different region and the
 replication process will be managed by AWS. Make sure you've set Network ACL, Subnet, and
 Security Group according to your needs, so the secondary application node can access the database.
-Skip to the [Configure secondary application node](#configure-secondary-application-node) section below.
+Skip to the [Configure secondary application node](#configure-secondary-application-nodes-to-use-the-external-read-replica) section below.
 
 #### Manually configure the primary database for replication
 

doc/administration/geo/replication/tuning.md

@@ -12,8 +12,6 @@ Increasing these values will increase the number of jobs that are scheduled.
 However, this may not lead to more downloads in parallel unless the number of
 available Sidekiq threads is also increased. For example, if repository sync
 capacity is increased from 25 to 50, you may also want to increase the number
-of Sidekiq threads from 25 to 50. See the [Sidekiq concurrency
-documentation][sidekiq-concurrency]
+of Sidekiq threads from 25 to 50. See the
+[Sidekiq concurrency documentation](../../operations/extra_sidekiq_processes.html#number-of-threads)
 for more details.
-
-[sidekiq-concurrency]: ../../operations/extra_sidekiq_processes.html#concurrency