Add missing step to `Modules/expat/refresh.sh` instructions (GH-144719)

diff --git a/Modules/expat/refresh.sh b/Modules/expat/refresh.sh
index 550340467a15a736c0ca33aedd8e7fcd151bce2b..0e0bc0652c55397c0303b951e753f2e2d85b969d 100755 (executable)
--- a/Modules/expat/refresh.sh
+++ b/Modules/expat/refresh.sh
@@ -64,13 +64,16 @@ This may be due to source changes and will require updating this script" >&2
   exit 1
 fi
 
-echo "
+echo '
 Updated! next steps:
 - Verify all is okay:
     git diff
     git status
-- Regenerate the sbom file
+- Update the sbom file:
+    Under the package "SPDXRef-PACKAGE-expat", update the "checksumValue",
+    "downloadLocation", "referenceLocator", and "versionInfo" fields.
+- Regenerate the sbom file:
     make regen-sbom
-- Update warning count in Tools/build/.warningignore_macos
+- Update the warning count in Tools/build/.warningignore_macos:
     (use info from CI if not on a Mac)
-"
+'