Update README.md

[HDCharles]

fixing link that got broken when fpx -> floatx dir name change

[pytorch-bot]

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✅ You can merge normally! (9 Unrelated Failures)

As of commit ec4a409 with merge base 4865ee6 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Run Float8 Tests / test (SM-89, linux.g6.4xlarge.experimental.nvidia.gpu, --pre torch --index-url https://download.p... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CPU 2.2.2, linux.4xlarge, torch==2.2.2 --index-url https://download.pytorch.org/whl/cpu "nu... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CPU 2.3, linux.4xlarge, torch==2.3.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CPU 2.4, linux.4xlarge, torch==2.4.0 --index-url https://download.pytorch.org/whl/cpu, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CPU Nightly, linux.4xlarge, --pre torch --index-url https://download.pytorch.org/whl/nightl... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA 2.2.2, linux.g5.12xlarge.nvidia.gpu, torch==2.2.2 "numpy<2" , cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA 2.3, linux.g5.12xlarge.nvidia.gpu, torch==2.3.0, cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA 2.4, linux.g5.12xlarge.nvidia.gpu, torch==2.4.0, cuda, 12.1) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run Regression Tests / test (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://download.pytorc... / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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