Remove version from custom ssl certificate docs

Author: alexbrazier

docusaurus/docs/using-https-in-development.md

@@ -35,8 +35,6 @@ Note that the server will use a self-signed certificate, so your web browser wil
 
 ## Custom SSL certificate
 
-You can also specify a custom certificate (available in `[email protected]` and higher).
-
 To set a custom certificate, set the `SSL_CRT_FILE` and `SSL_KEY_FILE` environment variables to the path of the certificate and key files in the same way you do for `HTTPS` above. Note that you will also need to set `HTTPS=true`.
 
 ### Linux, macOS (Bash)