docs: Clarify that ONNX plugin uses ONNX Runtime (#1013)

docs/getting_started.md

@@ -37,7 +37,7 @@ components:
 -   [Geant4](http://geant4.org/) for some examples
 -   [HepMC](https://gitlab.cern.ch/hepmc/HepMC3) >= 3.2.1 for some examples
 -   [Intel Threading Building Blocks](https://01.org/tbb) >= 2020.1 for the examples
--   [ONNX](https://onnx.ai) for the ONNX plugin and some examples
+-   [ONNX Runtime](https://onnxruntime.ai/) for the ONNX plugin and some examples
 -   [Pythia8](http://home.thep.lu.se/~torbjorn/Pythia.html) for some examples
 -   [ROOT](https://root.cern.ch) >= 6.20 for the TGeo plugin and the examples
 -   [Sphinx](https://www.sphinx-doc.org) >= 2.0 with [Breathe](https://breathe.readthedocs.io/en/latest/), [Exhale](https://exhale.readthedocs.io/en/latest/), and [recommonmark](https://recommonmark.readthedocs.io/en/latest/index.html) extensions for the documentation