doc: fix keepAliveTimeout default in http.createServer options

PR #62782 updated the keepAliveTimeout default from 5s to 65s and
correctly updated server.keepAliveTimeout (line 2006), but the
http.createServer() options table at line 3775 was not updated.

Fix the remaining reference to reflect the current default of 65000ms.

Author: jahanzaib-iqbal-dev

doc/api/http.md

@@ -3772,7 +3772,7 @@ changes:
     needs to wait for additional incoming data, after it has finished writing
     the last response, before a socket will be destroyed.
     See [`server.keepAliveTimeout`][] for more information.
-    **Default:** `5000`.
+    **Default:** `65000`.
   * `maxHeaderSize` {number} Optionally overrides the value of
     [`--max-http-header-size`][] for requests received by this server, i.e.
     the maximum length of request headers in bytes.