The example code in website/OpenEXRCoreAPI.rst should be moved to individual files in website/src and included in the documentation files via .. literalinclude::, and also included in website/src/all.cpp so that it get built by CMake for testing and validation. See the other uses of literalinclude as examples.

This task requires some basic familiarity with reStructuredText and sphinx but the concepts are easy to pick up from other examples. See Building the Website for how to test the formatting.