Fix doc file name inconsistency (configuration -> configuring)

CHANGELOG.md

@@ -40,7 +40,7 @@ Additional details are available in [Setting up Mautrix Whatsapp bridging](docs/
 
 ## Support for controlling Matrix federation
 
-The playbook can now help you with [Controlling Matrix federation](docs/configuration-playbook-federation.md), should you wish to run a more private (isolated) server.
+The playbook can now help you with [Controlling Matrix federation](docs/configuring-playbook-federation), should you wish to run a more private (isolated) server.
 
 
 # 2018-10-24

docs/configuring-playbook.md

@@ -23,7 +23,7 @@ When you're done with all the configuration you'd like to do, continue with [Ins
 
 ## Other configuration options
 
-- [Controlling Matrix federation](configuration-playbook-federation.md) (optional)
+- [Controlling Matrix federation](configuring-playbook-federation) (optional)
 
 - [Adjusting email-sending settings](configuring-playbook-email.md) (optional)