adding implementation details to geometryConverters

[TianJingwd]

What is the change?

This PR adds additional implementation details on the impl tags within geometryConverters

Why is the change being made?

SQA work

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Checklist

• This PR has only one purpose or idea.
• Tests have been added/updated to verify that the new/changed code works.

• The code style follows good practices.
• The commit message(s) follow good practices.

• The release notes (location doc/release/0.X.rst) are up-to-date with any important changes.
• The documentation is still up-to-date in the doc folder.
• If any requirements were affected, mention it in the release notes.
• The dependencies are still up-to-date in pyproject.toml.

[CLAassistant]

All committers have signed the CLA.

[albeanth]

Just a couple of comments before handing this over to @opotowsky .

[opotowsky]

I think things read really well and represent the code. Just a few typos!

[opotowsky]

All done -- great work and thank you @TianJingwd !