Easy to fix docs corrections

[xrdy511623]

Bug description

in the jupyterhub_config.py, I set c.Authenticator.add_two_factor_authentication = True. However，
while I start jupyterhub service, a warning occurs that Config option add_two_factor_authentication not recognized by NativeAuthenticator. Anyone who knows where I went wrong?

Expected behaviour

I except the configuration that c.Authenticator.add_two_factor_authentication = True would take effect.

Actual behaviour

As a result, a warning occurs that Config option add_two_factor_authentication not recognized by NativeAuthenticator.

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[xrdy511623]

I have read the source code , now I know that the official documentation is wrong. The source code like this:

allow_2fa = Bool(
        False,
        config=True,
        help=""
    )

class SignUpHandler(LocalBase):
    """Render the sign in page."""
    async def get(self):
        if not self.authenticator.enable_signup:
            raise web.HTTPError(404)

        self._register_template_path()
        html = self.render_template(
            'signup.html',
            ask_email=self.authenticator.ask_email_on_signup,
            two_factor_auth=self.authenticator.allow_2fa,
        )
        self.finish(html)

Hence, If you set c.Authenticator.allow_2fa = True, the problem should be solved.

[consideRatio]

@xrdy511623 thanks for writing an issue about this and summarizing what the solution was! I'm opening it again until the documentation is fixed.

Issue summary

The documentation here use the wrong configuration name (add_two_factor_authentication), it should be allow_2fa.

nativeauthenticator/docs/options.rst

Line 122 in e66ef40

c.Authenticator.add_two_factor_authentication = True

[xrdy511623]

Also, the options.rst on minimum password length is wrong, which sets the attribute like this:
c.Authenticator.minimim_password_length = 10

However, it can not be recognized by nativeauthenticator for spelling mistake, the correct setting should be like this:

c.Authenticator.minimum_password_length = 10