docs: Updated alias (#1511)

The expression in alias `(+*)` is invalid and a correct working method would be `(.*)`

Author: markbattistella

docs/configuration.md

@@ -354,7 +354,7 @@ Set the route alias. You can freely manage routing rules. Supports RegExp.
 ```js
 window.$docsify = {
   alias: {
-    '/foo/(+*)': '/bar/$1', // supports regexp
+    '/foo/(.*)': '/bar/$1', // supports regexp
     '/zh-cn/changelog': '/changelog',
     '/changelog':
       'https://raw.githubusercontent.com/docsifyjs/docsify/master/CHANGELOG',