Improve Locator docstrings

[dstansby]

PR summary

Improves Locator docstrings by adding a single sentence at the beginning of each docstring in a consistent style.

PR checklist

• "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
• Documentation complies with general and docstring guidelines

[story645]

Like the uniformity a lot, but think Places/positions ticks would be clearer.

Everything else is mostly various shades of small comments.

Also 🤦‍♀️ and apologies if draft meant this wasn't ready for review.

[dstansby]

Also 🤦‍♀️ and apologies if draft meant this wasn't ready for review.

No a review is very welcome 😄 - I tend to open PRs in draft until the CI passes just in case.

[story645]

mostly nits, but maybe linearly spaced->evenly spaced for clarity?

[story645]

Can I squash merge (or you can squash merge) or do you want to rebase?

[dstansby]

👍 to squash merging