docs: Fix documentation for LTI1.1

[martinclaus]

When using ltiauthenticator.LTIAuthenticator as the authenticator class, the respective section in the config.yml must be named LTIAuthenticator for the traitlet system to work.

Alternatively, one could instead change to

JupyterHub:
    authenticator_class: ltiauthenticator.lti11.auth.LTI11Authenticator

in the config.yml which would be analogous to the LTI1.3 configuration.

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[jgwerner]

Hi @martinclaus ! Thank you so much for picking up on this documentation update. We will go ahead and merge this to avoid future headaches when using the config.yml.

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