Summary

Delete an outdated sentence about GPU-aware MPI in the particle documentation.

The up-to-date information about GPU-awareness is located in Docs/sphinx_documentation/source/GPU.rst. See in particular https://amrex-codes.github.io/amrex/docs_html/GPU.html#particle-support and https://amrex-codes.github.io/amrex/docs_html/GPU.html#inputs-parameters.

Additional background

Checklist

The proposed changes:

• fix a bug or incorrect behavior in AMReX
• add new capabilities to AMReX
• changes answers in the test suite to more than roundoff level
• are likely to significantly affect the results of downstream AMReX users
• include documentation in the code and/or rst files, if appropriate