Note the need to maybe update index.md in the help text

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/update_psa_crypto_api.sh b/update_psa_crypto_api.sh
index 533e986..662033c 100755
--- a/update_psa_crypto_api.sh
+++ b/update_psa_crypto_api.sh
@@ -17,7 +17,11 @@
     cd ..
 3. Copy the rendered files.
     $0 psa-crypto-api
-4. Commit the changes.
+4. If this is a new numbered version:
+    edit docs/psa/index.md # Add the new version
+    make
+    ln -snf <VERSION> docs/latest
+5. Commit the changes.
     git add docs/html docs/PSA_Cryptography_API_Specification.pdf
     git commit
 EOF