That would translate to:

paths:
  /2.0/repositories/{username}:
    get:

Author: tfesenko

versions/3.0.md

@@ -2069,7 +2069,7 @@ value), references MAY also be made through a relative `operationRef`:
 links:
   UserRepositories:
     # returns array of '#/components/schemas/repository'
-    operationRef: '#/paths/~12.0~1repositories~1/{username}/get'
+    operationRef: '#/paths/~12.0~1repositories~1{username}/get'
     parameters:
       username: $response.body#/username
 ```