fine tune instructions for Apple.pem

Author: drwetter

etc/README.md

@@ -10,11 +10,11 @@ The certificate trust stores were retrieved from
 * **Apple:**
     1. __System:__ from Apple OS X keychain app.  Open Keychain Access utility, i.e.
   In the Finder window, under Favorites --> "Applications" --> "Utilities"
-  (OR perform a Spotlight Search for Keychain Access)
-  --> "Keychain Access" (2 click). In that window --> "Keychains" --> "System"
+  (OR perform a Spotlight Search for "Keychain Access")
+  --> "Keychain Access" (2 click). In that window --> "Keychains" --> "System Root"
   --> "Category" --> "All Items"
-  Select all CA certificates except for Developer ID Certification Authority,  "File" --> "Export Items"
-    2. __Internet:__ Pick the latest subdir (=highest number) from https://opensource.apple.com/source/security_certificates/. They are in DER format despite their file extension. Download them with ``wget --level=1 --cut-dirs=5 --mirror --convert-links --adjust-extension --page-requisites --no-parent https://opensource.apple.com/source/security_certificates/security_certificates-*/certificates/roots/``
+  Select all CA certificates except for "Developer ID Certification Authority", omit expired ones,  "File" --> "Export Items"
+    2. __Internet:__ Pick the latest subdir (=highest number) from https://opensource.apple.com/source/security_certificates/. They are in DER format despite their file extension. Download them with ``wget --level=1 --cut-dirs=5 --mirror --convert-links --adjust-extension --page-requisites --no-parent https://opensource.apple.com/source/security_certificates/security_certificates-<latest>/certificates/roots/``
 
 
 Google Chromium uses basically the trust stores above, see https://www.chromium.org/Home/chromium-security/root-ca-policy.