message: Adding missing description of the runtime field in router check config
diff: @@ -46,11 +46,12 @@ expects a cluster name match of "instant-server".::
  - test_name: ...,
  input:
  authority: ...,
  - path": ...,
  - method": ...,
  - internal" : ...,
  - random_value" : ...,
  - ssl" : ...,
  + path: ...,
  + method: ...,
  + internal: ...,
  + random_value: ...,
  + ssl: ...,
  + runtime: ...,
  - additional_headers:
  key: ...,
  value: ...
  @@ -97,6 +98,12 @@ input
  a client issuing a request via http or https. By default ssl is false which corresponds to
  x-forwarded-proto set to http.
  + runtime
  + *(optional, string)* A string representing the runtime setting to enable for the test. The runtime
  + setting along with the random_value is used by the router to decide if the route should be enabled.
  + Only a random_value lesser than the fractional percentage defined on the route entry enables the
  + route.
  +
  additional_headers
  *(optional, array)* Additional headers to be added as input for route determination. The "authority",
  "path", "method", "x-forwarded-proto", and "x-envoy-internal" fields are specified by the other config
  