Update tpa_oauth.rst

Description

Update the THIRD_PARTY_AUTH_BACKENDS names since the upstream library had changed the name.

For example, the latest location of the backends is: `/openedx/venv/lib/python2.7/site-packages/social_core/backends/`, the lms service won't start if we don't give the correct names.

Done

Assignee

Ned Batchelder

Reporter

Open Source Pull Request Bot

Contributor Name

Max Mok

Repo

edx/edx-documentation

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