docs(gpu): drop false auto-set claim for gfx1151 env vars

The ROCm/hipblas image does not set HSA_OVERRIDE_GFX_VERSION,
ROCBLAS_USE_HIPBLASLT, HSA_XNACK, or HSA_ENABLE_SDMA. Remove the
misleading parenthetical so readers know to pass them explicitly.

Fixes #12071

Assisted-by: Cursor:Composer
Signed-off-by: lei_lei <imleilei123@gmail.com>
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