minor #10012 Fix broken link to vue-loader documentation. (shulard)

This PR was submitted for the 4.1 branch but it was merged into the 3.4 branch instead (closes #10012).

Discussion
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Fix broken link to `vue-loader` documentation.

The page https://vue-loader.vuejs.org/en/configurations/advanced.html doesn't exist anymore, use that one instead: https://vue-loader.vuejs.org/options.html

Commits
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25734d2 Fix broken link to `vue-loader` documentation.

Author: javiereguiluz

frontend/encore/vuejs.rst

@@ -27,7 +27,7 @@ also configure the `vue-loader options`_ via a callback:
 .. code-block:: javascript
 
     .enableVueLoader(function(options) {
-        // https://vue-loader.vuejs.org/en/configurations/advanced.html
+        // https://vue-loader.vuejs.org/options.html
 
         options.preLoaders = {
             js: '/path/to/custom/loader'
@@ -53,4 +53,4 @@ See :doc:`/frontend/encore/dev-server` for more details.
 
 .. _`babel-preset-react`: https://babeljs.io/docs/plugins/preset-react/
 .. _`Vue.js`: https://vuejs.org/
-.. _`vue-loader options`: https://vue-loader.vuejs.org/en/configurations/advanced.html
+.. _`vue-loader options`: https://vue-loader.vuejs.org/options.html