Fix skip reason error message for entrypoint test

Author: agriyakhetarpal

numcodecs/tests/test_entrypoints_backport.py

@@ -30,7 +30,7 @@ def get_entrypoints_with_importlib_metadata_loaded():
     assert cls.codec_id == "test"
 
 
-@pytest.mark.skipif(is_wasm, reason="Threads are not supported in Pyodide/WASM")
+@pytest.mark.skipif(is_wasm, reason="Spawning processes is not supported in Pyodide/WASM")
 def test_entrypoint_codec_with_importlib_metadata():
     p = Process(target=get_entrypoints_with_importlib_metadata_loaded)
     p.start()