[Documentation] add fp variant pwmat #774
Description
It should be added to dpgen.generator.arginfo.fp_style_variant_type_args. The arguments should include what is used in the generator.py, especially for the FP style pwmat.
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It should be added to dpgen.generator.arginfo.fp_style_variant_type_args. The arguments should include what is used in the generator.py, especially for the FP style pwmat.