Fix C/C++ documentation generation (#25112)
### Description
Missed a few documentation errors in the [previous
PR](https://github.com/microsoft/onnxruntime/pull/24887). This PR fixes
the C/C++ API documentation generation action:
https://github.com/microsoft/onnxruntime/actions/runs/15749541590
### Motivation and Context
Fix the C/C++ API documentation generation GitHub action.
