Fix C++ documentation generation (#26901)

### Description
Fixes C++ documentation generation errors introduced in previous PRs
that added APIs for plugin EPs.

Passing run:
https://github.com/microsoft/onnxruntime/actions/runs/20668349351

Author: adrianlizarraga

include/onnxruntime/core/session/onnxruntime_ep_c_api.h

@@ -348,11 +348,11 @@ struct OrtKernelImpl {
    *                      the application for the session/environment (e.g., via CreateAndRegisterAllocator[V2]
    *                      or RegisterAllocator), or an allocator on the OrtEpDevice (read-only or default) otherwise.
    *                      The allocator remains valid throughout the lifetime of the OrtKernelImpl instance.
-   * \param[in] prepacked_weights_cache May be NULL. If not NULL, the kernel may choose to share a packed weight by
-   *                                    first storing it in the OrtSharedPrePackedWeightCache instance and then
-   *                                    receiving the actual shared weight data in the call to
-   *                                    OrtKernelImpl::SetSharedPrePackedWeight(). See the above description for
-   *                                    "sharing mode".
+   * \param[in] prepacked_weight_cache May be NULL. If not NULL, the kernel may choose to share a packed weight by
+   *                                   first storing it in the OrtSharedPrePackedWeightCache instance and then
+   *                                   receiving the actual shared weight data in the call to
+   *                                   OrtKernelImpl::SetSharedPrePackedWeight(). See the above description for
+   *                                   "sharing mode".
    * \param[out] is_packed Output parameter that the implementation sets to true if the kernel packed the tensor data.
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
@@ -868,8 +868,8 @@ struct OrtEpApi {
   /** \brief Gets the kernel's opset version range that is supported.
    *
    * \param[in] kernel_def The OrtKernelDef instance.
-   * \param[out] version_start Output parameter set to the starting opset version that is supported.
-   * \param[out] version_end Output parameter set to the ending opset version (inclusive) that is supported.
+   * \param[out] start_version Output parameter set to the starting opset version that is supported.
+   * \param[out] end_version Output parameter set to the ending opset version (inclusive) that is supported.
    *
    * \snippet{doc} snippets.dox OrtStatus Return Value
    *
@@ -954,7 +954,7 @@ struct OrtEpApi {
    *
    * \note Subsequent calls with the same OrtSharedPrePackedWeightCache instance release and replace the old data.
    *
-   * \param[in] this_ptr The OrtKernelImpl instance.
+   * \param[in] prepacked_weight_cache The OrtSharedPrePackedWeightCache instance.
    * \param[in] buffer_data_ptrs An array of buffer data pointers that collectively hold the pre-packed data for a
    *                             single shared weight. Note that sometimes a single weight may have multiple pre-packed
    *                             buffers and it is up to the kernel implementation to determine how to split the data