clean up 0.8 whatsnew, other minor doc issues

[wholmgren]

• Closes change whats new API section names #1009
• I am familiar with the contributing guidelines
• Tests added
• Updates entries to docs/sphinx/source/api.rst for API changes.
• Adds description and name entries in the appropriate "what's new" file in docs/sphinx/source/whatsnew for all changes. Includes link to the GitHub Issue with :issue:`num` or this Pull Request with :pull:`num`. Includes contributor name and/or GitHub username (link with :ghuser:`user`).
• New code is fully documented. Includes numpydoc compliant docstrings, examples, and comments where necessary.
• Pull request is nearly complete and ready for detailed review.
• Maintainer: Appropriate GitHub Labels and Milestone are assigned to the Pull Request and linked Issue.

Please let me know if I've missed any contributors to issue/PR discussions that were closed in this release.

[kandersolar]

A handful of nits

[wholmgren]

@cwhanse @mikofski @kanderso-nrel any final edits? I plan to tag 0.8.0 once this is merged.

Rendered whats new: https://pvlib-python--1054.org.readthedocs.build/en/1054/whatsnew.html

[mikofski]

This bullet in enhancements could be formatted:

Added racking_model, module_type, and temperature_model_parameters to PVSystem, LocalizedPVSystem, SingleAxisTracker, and LocalizedSingleAxisTracker repr methods. (GH1027)

I think the arguments should have double backticks and the classes should be linked to module index

[mikofski]

LGTM! Thanks Will!

[cwhanse]

Only edit I saw, @mikofski noted.

[wholmgren]

I should have listened to @kanderso-nrel when he caught that in the PR review. If that's a rule it should be in the Contributing/Documentation section.