Fix typo in link

Author: theyosh

docs/_posts/2021-12-10-release_4.1.md

@@ -42,7 +42,7 @@ This also means that you can run TerrariumPI on a newer Debian (Bullseye). Nativ
 
 ## New hardware
 
-In this release we also have some new hardware that we support. Those are the [Qwiic Relay]({% link _hardware/qwiic_relay.md %}) and [newer relay cards of Sequent Microsystems]({% link _hardware/8relay-stack_v4.md %})
+In this release we also have some new hardware that we support. Those are the [Qwiic Relay]({% link _hardware/qwiic-relay.md %}) and [newer relay cards of Sequent Microsystems]({% link _hardware/8relay-stack_v4.md %})
 
 So, go the [installation]({% link _tabs/install.md %}) page in order to install Terrarium PI version 4.