doc: clarify tls.tlsSocket.getCipher().version

The getCipher() returns a tuple that includes protocol version string.
This string refers to the minimum protocol version string, as per
documentation. What is missing is a reference to the documentation
where to get the negotiated cipher for the socket connection and
a clearer example.

Fixes: #43406
PR-URL: #44086
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

doc/api/tls.md

@@ -1091,17 +1091,17 @@ changes:
   * `name` {string} OpenSSL name for the cipher suite.
   * `standardName` {string} IETF name for the cipher suite.
   * `version` {string} The minimum TLS protocol version supported by this cipher
-    suite.
+    suite. For the actual negotiated protocol, see [`tls.TLSSocket.getProtocol()`][].
 
 Returns an object containing information on the negotiated cipher suite.
 
-For example:
+For example, a TLSv1.2 protocol with AES256-SHA cipher:
 
 ```json
 {
-    "name": "AES128-SHA256",
-    "standardName": "TLS_RSA_WITH_AES_128_CBC_SHA256",
-    "version": "TLSv1.2"
+    "name": "AES256-SHA",
+    "standardName": "TLS_RSA_WITH_AES_256_CBC_SHA",
+    "version": "SSLv3"
 }
 ```
 
@@ -2237,6 +2237,7 @@ added: v11.4.0
 [`tls.Server`]: #class-tlsserver
 [`tls.TLSSocket.enableTrace()`]: #tlssocketenabletrace
 [`tls.TLSSocket.getPeerCertificate()`]: #tlssocketgetpeercertificatedetailed
+[`tls.TLSSocket.getProtocol()`]: #tlssocketgetprotocol
 [`tls.TLSSocket.getSession()`]: #tlssocketgetsession
 [`tls.TLSSocket.getTLSTicket()`]: #tlssocketgettlsticket
 [`tls.TLSSocket`]: #class-tlstlssocket