Correct various docstring typos and inaccuracies.

Review Request #8219 — Created June 4, 2016 and submitted — Latest diff uploaded

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Review Board
master
b9317cf...

Reviewers

Fixes some miscellaneous docstring issues I've encountered across the code base:

1. In extensions.hooks.APIExtraDataAccessHook, fix a typo where 'private_data' was spelled incorrectly.
2. In webapi.tests.mixins_review, update a collection of HTTP PUT tests that were incorrectly labeled as HTTP POST.