Doc link fixes

docs/setup.md

@@ -123,4 +123,4 @@ bits of functionality with their own commands and subcommands. E.g. the thingy
 that detects join raids is its own cog. They're all disabled by default, so
 you'll want to enable whichever ones suit you.
 
-More details in [Commands][commands.md].
+More details in [Commands](commands.md).