Update CHANGELOG.md (multiple scalar fields)

I just added Rafa Fuentes and Maria Camisassa to the credits for the multiple-scalar fields change.  While they didn't author a commit, they helped to test the new functionality against known solutions.

CHANGELOG.md

@@ -11,7 +11,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 - Rayleigh's configure script now supports the MKL package provided by the Debian and Ubuntu package repositories.  This feature is accessed by invoking the -debian-mkl flag when running configure.  \[Philipp Edelmann; 9-14-2022; [#386](https://github.com/geodynamics/Rayleigh/pull/386)\]
 
-- Rayleigh's equation set can now be extended to evolve multiple passive and/or active scalar fields.  \[Cian Wilson, Nick Featherstone and Loren Matilsky; 11-22-2022; [#408](https://github.com/geodynamics/Rayleigh/pull/408); 12-2-2022 [#415](https://github.com/geodynamics/Rayleigh/pull/408)\; 1-5-2023 [#429](https://github.com/geodynamics/Rayleigh/pull/429) 1-30-2023 [#442](https://github.com/geodynamics/Rayleigh/pull/442)]
+- Rayleigh's equation set can now be extended to evolve multiple passive and/or active scalar fields.  \[Cian Wilson, Nick Featherstone, Loren Matilsky, Rafael Fuentes and Maria Camisassa; 11-22-2022; [#408](https://github.com/geodynamics/Rayleigh/pull/408); 12-2-2022 [#415](https://github.com/geodynamics/Rayleigh/pull/408)\; 1-5-2023 [#429](https://github.com/geodynamics/Rayleigh/pull/429) 1-30-2023 [#442](https://github.com/geodynamics/Rayleigh/pull/442)]
 
 - A new Docker image of Rayleigh, based on Ubuntu Jammy, is now generated whenever a PR is merged into master or a new release is created.  \[Rene Gassmoeller and Philipp Edelmann; 9-14-2022 and 9-15-2022; [#385](https://github.com/geodynamics/Rayleigh/pull/385), [#387](https://github.com/geodynamics/Rayleigh/pull/387), [#391](https://github.com/geodynamics/Rayleigh/pull/391), [#392](https://github.com/geodynamics/Rayleigh/pull/392) ]