TheArtOfHttpScripting: phrase it TLS lib agnostic

docs/TheArtOfHttpScripting

@@ -557,8 +557,10 @@ The Art Of Scripting HTTP Requests Using Curl
  truckload of advanced features to allow all those encryptions and key
  infrastructure mechanisms encrypted HTTP requires.
 
- Curl supports encrypted fetches thanks to the freely available OpenSSL
- libraries. To get a page from a HTTPS server, simply run curl like:
+ Curl supports encrypted fetches when built to use a TLS library and it can be
+ built to use one out of a fairly large set of libraries - "curl -V" will show
+ which one your curl was built to use (if any!). To get a page from a HTTPS
+ server, simply run curl like:
 
         curl https://secure.example.com