ORT-OVEP Doc update (#24395)
### Description
This PR updates the ONNX Runtime documentation to reflect the changes
and aligns with ORT 1.21.0.
---------
Co-authored-by: sfatimar <jatin.wadhwa@intel.com>
Co-authored-by: vthaniel <vishnudas.thaniel.s@intel.com>
Co-authored-by: TejalKhade28 <tejal.khade@intel.com>
