Since tag 2024.w45/commit f54ca571,
standalone mode/--sa is the default and does not exist. Correspondingly,
it has been removed from the documentation.

For users reading recent documentation, but running an older version of
OAI, there might be a mismatch in that --sa is necessary to run OAI, but
not given in the documentation. Provide explanatory text to make users
aware of this.