3196 update plasma geometry and shaping documentation to include new models

Description

I confirm that I have completed the following checks:

[ ] I have justified any large differences in the regression tests caused by this pull request in the comments.
[ ] I have added new tests where appropriate for the changes I have made.
[ ] If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
[ ] If I have made documentation changes, I have checked they render correctly.
[ ] I have added documentation for my change, if appropriate.