update readme

Author: yury-s

playwright/src/test/resources/client-certificates/README.md

@@ -8,7 +8,8 @@ bash generate.sh
 
 ## Java: Convert PEM Files to PKCS12
 
-Java server understands only PKCS12 keys, so we need to convert.
+
+Java server understands only PKCS12 keys, after copying the certificates from Node.js Playwright we need to convert them.
 
 ```
 bash generate_java.sh