Document InteractionOperator Hermitian assumptions

[matti-sarjala]

Fixes #479.

This updates the InteractionOperator docstring to clarify that the representation is intended for Hermitian interaction Hamiltonians, such as molecular electronic-structure Hamiltonians.

For arbitrary non-Hermitian fermionic operators, users should use FermionOperator. This is important because transform routines specialized for InteractionOperator may rely on Hermitian structure assumptions.

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[gemini-code-assist]

Code Review

This pull request updates the docstring for the InteractionOperator class to clarify that it is intended for Hermitian interaction Hamiltonians, such as molecular electronic-structure Hamiltonians, and is not a general-purpose container for non-Hermitian fermionic operators. No review comments were provided, so I have no feedback to offer.