message: Move section on tf.debugging.enable_check_numerics to its own subsection
diff: @@ -55,6 +55,8 @@ Because of [issues with building on windows](https://github.com/tensorflow/tenso
  * Add an `errno`-like field to `NNAPI` delegate for detecting `NNAPI` errors for fallback behaviour.
  * Refactors `NNAPI` Delegate to support detailed reason why an operation is not accelerated.
  * Converts hardswish subgraphs into atomic ops.
  +* `tf.debugging`
  + * * Add `tf.debugging.enable_check_numerics()` and `tf.debugging.disable_check_numerics()` to facilitate debugging of numeric instability (issues involving infinities and `NaN`s).
  * Other
  * Add `RaggedTensor.merge_dims()`.
  * Added new `uniform_row_length` row-partitioning tensor to `RaggedTensor`.
  @@ -66,7 +68,7 @@ Because of [issues with building on windows](https://github.com/tensorflow/tenso
  * Add preliminary support for sparse CSR matrices.
  * Tensor equality with `None` now behaves as expected.
  * Make calls to `tf.function(f)()`, `tf.function(f).get_concrete_function` and `tf.function(f).get_initialization_function` thread-safe.
  - * Add `tf.debugging.enable_check_numerics()` and `tf.debugging.disable_check_numerics()` to facilitate debugging of numeric instability (`Infinity`s and `NaN`s) under eager mode and `tf.function`s.
  + (`Infinity`s and `NaN`s) under eager mode and `tf.function`s.
  * Extend `tf.identity` to work with CompositeTensors (such as SparseTensor)
  * Added more `dtypes` and zero-sized inputs to `Einsum` Op and improved its performance
  * Enable multi-worker `NCCL` `all-reduce` inside functions executing eagerly.
  