docs: fix incorrect field name in docker registry creds docs
@@ -365,7 +365,7 @@ The master supports the following configuration settings:
- ``username`` (required)
- ``password`` (required)
- - ``server`` (optional)
+ - ``serveraddress`` (optional)
- ``email`` (optional)
- ``root``: Specifies the root directory of the state files. Defaults
