FineGrainedFP8Config: drop the frozen-notice docstring line
`c66564416e` restored the class and added a line saying it "configures the
frozen `finegrained_fp8` integration". That is not true: it sets
`quant_method="fp8"`, which `AUTO_QUANTIZER_MAPPING` routes to
`FineGrainedHfQuantizer` — the frozen quantizer is not reachable through
`from_pretrained` at all.
Removing it also leaves the class byte-identical to main, which is what a class
frozen for backward compatibility should look like in a diff. Which config
serves which family is already stated where a reader meets it, in
`FineGrainedConfig`'s own docstring on the same docs page.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>