Updated field names

Signed-off-by: Mike McKiernan <mmckiernan@nvidia.com>

Author: mikemckiernan

docs/getting-started/5-output-rails/README.md

@@ -172,7 +172,7 @@ You can enable streaming to provide asynchronous responses and reduce the time t
 1. Modify the `rails` field in the `config.yml` file and add the `streaming` field to enable streaming:
 
    ```{code-block} yaml
-   :emphasize-lines: 9,10,12
+   :emphasize-lines: 9-11,13
 
    rails:
      input:
@@ -183,7 +183,8 @@ You can enable streaming to provide asynchronous responses and reduce the time t
        flows:
          - self check output
        streaming:
-          window_size: 200
+          chunk_size: 200
+          context_size: 50
 
    streaming: True
    ```