Sync apiserver.conf notes with docs

[djiboshin]

The existing note in default apiserver.conf includes a command to generate a bcrypt-hashed password, but it omits the base64 encoding step:

python -c 'import bcrypt; print(bcrypt.hashpw("password", bcrypt.gensalt()))'

This may be misleading for new users, since the server expects base64-encoded hashes.

The note is updated to include the correct code snippet with base64 encoding, as shown in the documentation:

python -c 'import bcrypt,base64; print(base64.b64encode(bcrypt.hashpw("password".encode(), bcrypt.gensalt())))'