ciflow/trunk/201269: Document float8_e5m3fnu format and special values

发生了什么

Address review: link the public PTX ISA definition instead of naming a vendor format, define the "u" suffix, and document bias, subnormals, the finite exponent-31 codes, the NaN encoding, and cast semantics.

摘要按规则整理自下方来源原文

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