Consolidate -Fbox documentation with lists

[maxrjones]

Description of proposed changes

This PR puts the list describing the -Fbox option in a separate ReST file and links to it from the various modules that support -Fbox.

Fixes #

Reminders

• Make sure that your code follows our style. Use the other functions/files as a basis.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Describe changes to function behavior and arguments in a comment below the function declaration.
• If adding new functionality, add a detailed description to the documentation and/or an example.

[PaulWessel]

Great!