Tiny fix

templates/doc.md

@@ -19,7 +19,7 @@ This server does a few things:
 
 ## Data format
 
-If you do an HTTPS GET against `graph/`, you will receive some JSON.
+If you do an HTTPS GET against `/graph`, you will receive some JSON.
 
     :::bash
     $ curl https://abv.peteshadbolt.co.uk/graph