Consistent NatSpec comments

[cam-schultz]

Context and scope
We should be consitent and rigorous in our use of NatSpec documentation comments: https://docs.soliditylang.org/en/latest/natspec-format.html

Discussion and alternatives
What follows is a non-exhaustive style guide that should be adhered to:

• Interface function declarations should specify function behavior and all inputs and outputs
• The same applies to top-level function definitions in an inheritance hierarchy
• Implementations of interfaces and overrides should include a reference to the top-level declaration, e.g. @dev See {ITeleporterMessenger-sendCrossChainMessage}