XML-RPC: Update specUrl links in IXR_Server and IXR_IntrospectionServer.

As the original URLs are no longer accessible, this commit uses the latest available copy of the corresponding documentation from the Wayback Machine.

Follow-up to [1346], [56167].

Props mayur8991, panchalhimani711, SergeyBiryukov.
Fixes #63848.

git-svn-id: https://develop.svn.wordpress.org/trunk@60655 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/IXR/class-IXR-introspectionserver.php

@@ -19,7 +19,7 @@ function __construct()
         $this->setCallbacks();
         $this->setCapabilities();
         $this->capabilities['introspection'] = array(
-            'specUrl' => 'http://xmlrpc.usefulinc.com/doc/reserved.html',
+            'specUrl' => 'https://web.archive.org/web/20050404090342/http://xmlrpc.usefulinc.com/doc/reserved.html',
             'specVersion' => 1
         );
         $this->addCallback(

src/wp-includes/IXR/class-IXR-server.php

@@ -161,15 +161,15 @@ function setCapabilities()
         // Initialises capabilities array
         $this->capabilities = array(
             'xmlrpc' => array(
-                'specUrl' => 'http://www.xmlrpc.com/spec',
+                'specUrl' => 'https://xmlrpc.com/spec.md',
                 'specVersion' => 1
         ),
             'faults_interop' => array(
-                'specUrl' => 'http://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php',
+                'specUrl' => 'https://web.archive.org/web/20240416231938/https://xmlrpc-epi.sourceforge.net/specs/rfc.fault_codes.php',
                 'specVersion' => 20010516
         ),
             'system.multicall' => array(
-                'specUrl' => 'http://www.xmlrpc.com/discuss/msgReader$1208',
+                'specUrl' => 'https://web.archive.org/web/20060624230303/http://www.xmlrpc.com/discuss/msgReader$1208?mode=topic',
                 'specVersion' => 1
         ),
         );

src/wp-includes/class-wp-xmlrpc-server.php

@@ -6544,7 +6544,7 @@ public function mw_newMediaObject( $args ) {
 
 	/*
 	 * MovableType API functions.
-	 * Specs archive on http://web.archive.org/web/20050220091302/http://www.movabletype.org:80/docs/mtmanual_programmatic.html
+	 * Specs archive on https://web.archive.org/web/20050220091302/http://www.movabletype.org/docs/mtmanual_programmatic.html
 	 */
 
 	/**