docs: improved manual steps for macOS (#3565)

Author: UlisesGascon

ansible/MANUAL_STEPS.md

@@ -128,15 +128,15 @@ As root:
 * Transfer to release machine (scp to /tmp)
 * `sudo security import /tmp/Apple\ Developer\ ID\ Node.js\ Foundation.p12 -k /Library/Keychains/System.keychain -T /usr/bin/codesign -T /usr/bin/productsign -P 'XXXX'` (where XXXX is found in secrets/build/release/apple.md) (`security unlock-keychain -u /Library/Keychains/System.keychain` _may_ be required prior to running this command).
 
-#### Validating certificates are in date
+#### Validating certificates are in date and valid
 
-1. security -i unlock-keychain    (Enter the password for the machine located in secrets)
-2. security find-certificate -c "Developer ID Application" -p > /tmp/app.cert     (outputs the PEM format of the cert so we can properly inspect it)
-3. security find-certificate -c "Developer ID Installer" -p > /tmp/installer.cert
-4. openssl x509 -inform PEM -text -in /tmp/app.cert | less
-5. openssl x509 -inform PEM -text -in /tmp/installer.cert | less
-
-The last two steps will show the details of the certificates allowing to see expiry dates.
+1. `security -i unlock-keychain` Enter the password for the machine located in secrets
+2. `security find-certificate -c "Developer ID Application" -p > /tmp/app.cert` outputs the PEM format of the cert so we can properly inspect it
+3. `security find-certificate -c "Developer ID Installer" -p > /tmp/installer.cert`
+4. `openssl x509 -inform PEM -text -in /tmp/app.cert | less`
+5. `openssl x509 -inform PEM -text -in /tmp/installer.cert | less`
+6. `security find-identity -p codesigning -v`
+The steps 4 and 5 will show the details of the certificates allowing to see expiry dates.
 
 Example:
 
@@ -145,6 +145,15 @@ Not Before: Jan 22 03:40:05 2020 GMT
 Not After : Jan 22 03:40:05 2025 GMT
 ```
 
+The step 6 will show the list of certificates available on the machine.
+
+Example:
+
+```
+  1) XXXXXXXXXXX "Developer ID Application: Node.js Foundation (XXXXXXX)"
+1 valid identities found
+```
+
 ## macOS
 1. Update Sudoers file: