Match changes in gh-pages PR (#21628)

### Description
<!-- Describe your changes. -->
Update to match #21627 and make the info for Split consistent.

As a Split that doesn't split anything is a no-op it doesn't seem
meaningful to call that limitation out in the docs.


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

tools/ci_build/github/apple/coreml_supported_mlprogram_ops.md

@@ -24,7 +24,7 @@ Keep in sync with doco generated from /docs/execution-providers/CoreML-Execution
 |ai.onnx:Reshape||
 |ai.onnx:Resize|See [resize_op_builder.cc](https://github.com/microsoft/onnxruntime/blob/main/onnxruntime/core/providers/coreml/builders/impl/resize_op_builder.cc) implementation. There are too many permutations to describe the valid combinations.|
 |ai.onnx.Slice|starts/ends/axes/steps must be constant initializers.|
-|ai.onnx:Split||
+|ai.onnx:Split|If provided, `splits` must be constant.|
 |ai.onnx:Sub||
 |ai.onnx:Sigmoid||
 |ai:onnx:Tanh||

tools/ci_build/github/apple/coreml_supported_neuralnetwork_ops.md

@@ -35,7 +35,7 @@ Keep in sync with doco generated from /docs/execution-providers/CoreML-Execution
 |ai.onnx:Sigmoid||
 |ai.onnx:Slice|Inputs `starts`, `ends`, `axes`, and `steps` should be constant. Empty slice is not supported.|
 |ai.onnx:Softmax||
-|ai.onnx:Split|If provided, `splits` should be constant. num of outputs supported is at least 2.|
+|ai.onnx:Split|If provided, `splits` must be constant.|
 |ai.onnx:Squeeze||
 |ai.onnx:Sqrt||
 |ai.onnx:Sub||