Move num_cpu note to resources page to avoid confusion

[Superskyyy]

closes: #48867

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[can-anyscale]

@Superskyyy the following places in the doc refers to omp-num-thread-note which you deleted in your PR

[2024-11-22T18:47:06Z] /ray/doc/source/serve/resource-allocation.md:86: WARNING: 'myst' cross-reference target not found: 'omp-num-thread-note' [myst.xref_missing]
--
  | [2024-11-22T18:47:07Z] /ray/python/ray/train/tensorflow/tensorflow_trainer.py:docstring of ray.train.tensorflow.tensorflow_trainer.TensorflowTrainer:34: WARNING: undefined label: 'omp-num-thread-note'
  | [2024-11-22T18:47:07Z] /ray/doc/source/train/distributed-tensorflow-keras.rst:69: WARNING: undefined label: 'omp-num-thread-note'

[Superskyyy]

@Superskyyy the following places in the doc refers to omp-num-thread-note which you deleted in your PR

[2024-11-22T18:47:06Z] /ray/doc/source/serve/resource-allocation.md:86: WARNING: 'myst' cross-reference target not found: 'omp-num-thread-note' [myst.xref_missing]
--
  | [2024-11-22T18:47:07Z] /ray/python/ray/train/tensorflow/tensorflow_trainer.py:docstring of ray.train.tensorflow.tensorflow_trainer.TensorflowTrainer:34: WARNING: undefined label: 'omp-num-thread-note'
  | [2024-11-22T18:47:07Z] /ray/doc/source/train/distributed-tensorflow-keras.rst:69: WARNING: undefined label: 'omp-num-thread-note'

I see, let me fix that up.

[Superskyyy]

@can-anyscale Hi please review again. thanks