docs(core): note Program.compile(cache=...) in api reference

Author: cpcloud

cuda_core/docs/source/api.rst

@@ -256,6 +256,11 @@ Utility functions
 Program caches
 --------------
 
+``Program.compile`` accepts a ``cache=`` keyword argument that integrates
+with any :class:`~cuda.core.utils.ProgramCacheResource`, so callers can
+avoid recompiling identical source + options + target without writing the
+:func:`~cuda.core.utils.make_program_cache_key` lookup by hand.
+
 .. autosummary::
    :toctree: generated/