DOCSP-23133 fixed command in wrong order (#3674) (#3830)

Author: gmiller-mdb

source/appendix/security/appendixA-openssl-ca.txt

@@ -156,7 +156,7 @@ B. Generate the Test CA PEM File
 
    .. code-block:: bash
 
-      cat mongodb-test-ca.crt mongodb-test-ia.crt  > test-ca.pem
+      cat mongodb-test-ia.crt mongodb-test-ca.crt > test-ca.pem
 
 You can use the :red:`test` PEM file when configuring :binary:`~bin.mongod`,
 :binary:`~bin.mongos`, or :binary:`~bin.mongosh` for TLS/SSL :red:`testing`.