[Documentation] add model_devi Variant gromacs #771
Description
Gromacs Variant should be added into dpgen.generator.arginfo.model_devi_args, including docs.
It should reflect what is used in generator.py file.
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Gromacs Variant should be added into dpgen.generator.arginfo.model_devi_args, including docs.
It should reflect what is used in generator.py file.