docs: Fix reference to stats documentation (#26)

This PR fixes reference to `stats` subcommand documentation to point to
the correct file.

src/content/docs/configuration/config.mdx

@@ -36,7 +36,7 @@ key = "~/.atuin-session"
 
 ### `dialect`
 
-This configures how the [stats](/reference/stats.md) command parses dates. It has two
+This configures how the [stats](/reference/stats/) command parses dates. It has two
 possible values
 
 ```