Can eea_sendTransaction without nonce. Nonce is optional and will be correctly calculated if not included.
Remove or update note about using priv_getTransactionCount.
Add the following sentence back to the tip:
If not attempting to replace a pending transaction, do not
include the `nonce` in the private transaction object and nonce management is handled automatically.
EthSigner also now support private transactions sent to a privacy group (ie, not only a privateFor list)