3.0.4: fix Link Object example (OAI#3194)

Same fix has already been applied to 3.1.1-dev

Author: ralfhandl

versions/3.0.4.md

@@ -2061,7 +2061,7 @@ paths:
               operationId: getUserAddress
               parameters:
                 # get the `id` field from the request path parameter named `id`
-                userId: $request.path.id
+                userid: $request.path.id
   # the path item of the linked operation
   /users/{userid}/address:
     parameters: