Update checking-for-existing-gpg-keys.md (#35597)

Co-authored-by: Alex Nguyen <150945400+nguyenalex836@users.noreply.github.com>
Co-authored-by: Ben Ahmady <32935794+subatoi@users.noreply.github.com>

Author: 3 people

content/authentication/managing-commit-signature-verification/checking-for-existing-gpg-keys.md

@@ -30,6 +30,8 @@ shortTitle: Existing GPG keys
       # Prints the GPG public key, in ASCII armor format
       ```
 
+        Consider exporting your keys with the option `--export-options export-minimal`, which can prevent misreading keys that contain deprecated fields.
+
       You can then [add your GPG key to your GitHub account](/authentication/managing-commit-signature-verification/adding-a-gpg-key-to-your-github-account).
 
 ## Further reading