Add extra directions for how to download wasm wheels

Author: Luke Shaw

RELEASING.rst

@@ -110,7 +110,8 @@ Checking packaging
 
     [upload e.g.:] blosc2-3.2.0-cp312-cp312-pyodide_2024_0_wasm32.whl
 
-
+The wheels may be downloaded by going to "Actions->Python wheels for WASM" and selecting the completed workflow run for the version you are releasing.
+  Then, go to the "Artifacts" dropdown and download the WASM wheel file.
 Announcing
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