Docs: Replace HTTP links to stackoverflow.com in DocBlocks with HTTPS.

Update the Nginx "Missing (disappearing) HTTP Headers" link.

Props johnpgreen.
Fixes #41331.
Built from https://develop.svn.wordpress.org/trunk@41189


git-svn-id: http://core.svn.wordpress.org/trunk@41029 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/class-wp-rest-request.php

@@ -169,8 +169,8 @@ class WP_REST_Request implements ArrayAccess {
 	 * Note that we treat `-` (dashes) and `_` (underscores) as the same
 	 * character, as per header parsing rules in both Apache and nginx.
 	 *
-	 * @link http://stackoverflow.com/q/18185366
-	 * @link http://wiki.nginx.org/Pitfalls#Missing_.28disappearing.29_HTTP_headers
+	 * @link https://stackoverflow.com/q/18185366
+	 * @link https://www.nginx.com/resources/wiki/start/topics/tutorials/config_pitfalls/#missing-disappearing-http-headers
 	 * @link https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers
 	 *
 	 * @since 4.4.0

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-41188';
+$wp_version = '4.9-alpha-41189';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.