plum-dispatch functions don't render well in the documentation

[garrison]

See rendering at https://docs.quantum.ibm.com/api/qiskit-addon-aqc-tensor/simulation

Bugs with the Sphinx output

• Type annotations are fully qualified, unnecessarily. E.g., will say qiskit_addon_aqc_tensor.simulation.aer.state.QiskitAerMPS instead of QiskitAerMPS.
• The "parameters" and "return type" for each method should be removed. They're not even correct currently. Instead, probably the best solution is to have them be listed once per function (instead of for each method, too).
• each method is given a [source] link, but all of them link to the "abstract" method's source code. Ideally, it would link to the correct method in each case.

Additional bugs with docs.quantum.ibm.com rendering

• The type annotations are clickable links in the Sphinx output, but they are no longer clickable when rendered on docs.quantum.ibm.com.