Add missing GW docstrings

A bunch of functions/methods/classes in the GW sub-package are missing docstrings. This MR adds new docstrings to some of those and updates some others.

There are two deliberate code changes:

• removing the call to the vectorized spin conversion when possible
• removing the call to np.vectorize for redshift calculations that are no longer necessary after we pinned to astropy>=5

Closes #620 (closed)

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• 2f4b172b - Update docstrings

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• 5f3431db - Typo fix

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• 86e4af2b - Typo fix

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changed milestone to %1.2.0