Fix capitalization: cinny → Cinny

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-client-cinny.md

@@ -1,6 +1,6 @@
 # Setting up Cinny (optional)
 
-This playbook can install the [cinny](https://github.com/ajbura/cinny) Matrix web client for you.
+This playbook can install the [Cinny](https://github.com/ajbura/cinny) Matrix web client for you.
 
 Cinny is a web client focusing primarily on simple, elegant and secure interface. It can be installed alongside or instead of Element.