Fix description of oep mixing scheme in documentation
Description
Fixing description of OEPMixingScheme here: https://octopus-code.org/doc/11.2/html/vars/Hamiltonian.html#OEPMixingScheme
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Johannes Flick