doc: fix options order

Move the `joinDuplicateHeaders` option to the correct alphabetical
order.

PR-URL: nodejs#48617
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>

Author: lpinca

doc/api/http.md

@@ -3255,6 +3255,10 @@ changes:
   * `IncomingMessage` {http.IncomingMessage} Specifies the `IncomingMessage`
     class to be used. Useful for extending the original `IncomingMessage`.
     **Default:** `IncomingMessage`.
+  * `joinDuplicateHeaders` {boolean} It joins the field line values of multiple
+    headers in a request with `, ` instead of discarding the duplicates.
+    See [`message.headers`][] for more information.
+    **Default:** `false`.
   * `keepAlive` {boolean} If set to `true`, it enables keep-alive functionality
     on the socket immediately after a new incoming connection is received,
     similarly on what is done in \[`socket.setKeepAlive([enable][, initialDelay])`]\[`socket.setKeepAlive(enable, initialDelay)`].
@@ -3282,10 +3286,6 @@ changes:
     a 400 (Bad Request) status code to any HTTP/1.1 request message
     that lacks a Host header (as mandated by the specification).
     **Default:** `true`.
-  * `joinDuplicateHeaders` {boolean} It joins the field line values of multiple
-    headers in a request with `, ` instead of discarding the duplicates.
-    See [`message.headers`][] for more information.
-    **Default:** `false`.
   * `ServerResponse` {http.ServerResponse} Specifies the `ServerResponse` class
     to be used. Useful for extending the original `ServerResponse`. **Default:**
     `ServerResponse`.
@@ -3513,6 +3513,10 @@ changes:
     invalid HTTP headers when `true`. Using the insecure parser should be
     avoided. See [`--insecure-http-parser`][] for more information.
     **Default:** `false`
+  * `joinDuplicateHeaders` {boolean} It joins the field line values of
+    multiple headers in a request with `, ` instead of discarding
+    the duplicates. See [`message.headers`][] for more information.
+    **Default:** `false`.
   * `localAddress` {string} Local interface to bind for network connections.
   * `localPort` {number} Local port to connect from.
   * `lookup` {Function} Custom lookup function. **Default:** [`dns.lookup()`][].
@@ -3540,10 +3544,6 @@ changes:
   * `uniqueHeaders` {Array} A list of request headers that should be sent
     only once. If the header's value is an array, the items will be joined
     using `; `.
-  * `joinDuplicateHeaders` {boolean} It joins the field line values of
-    multiple headers in a request with `, ` instead of discarding
-    the duplicates. See [`message.headers`][] for more information.
-    **Default:** `false`.
 * `callback` {Function}
 * Returns: {http.ClientRequest}