doc: remove generated from dsaEncoding description

remove term `generated` from `dsaEncoding` parameter's description -
the parameter is used to specify the format of the signature,
function dictates the signature 'action'

PR-URL: https://github.com/nodejs/node/pull/37459
Fixes: https://github.com/nodejs/node/issues/37454


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>