expat/refresh.sh: Expand list of manual steps

Author: encukou

Modules/expat/refresh.sh

@@ -54,4 +54,13 @@ rm libexpat.tar.gz
 # Step 3: Add the namespacing include to expat_external.h
 sed -i 's/#define Expat_External_INCLUDED 1/&\n\n\/* Namespace external symbols to allow multiple libexpat version to\n   co-exist. \*\/\n#include "pyexpatns.h"/' expat_external.h
 
-echo "Updated; verify all is okay using git diff and git status."
+echo "
+Updated! next steps:
+- Verify all is okay:
+    git diff
+    git status
+- Regenerate the sbom file
+    make regen-sbom
+- Update warning count in Tools/build/.warningignore_macos
+    (use info from CI if not on a Mac)
+"