fix: Remove duplicated "the" (#1493)

Author: ixkaito

docs/dev-guide/ui-plugin-dev.md

@@ -688,7 +688,7 @@ If you use the `sharedData` option, the shared data can be updated by assigning
 <script>
 export default {
   sharedData: {
-    // Will sync the the 'my-message' shared data on the server
+    // Will sync the 'my-message' shared data on the server
     message: 'my-message'
   }
 }

packages/@vue/cli/lib/util/shouldUseTaobao.js

@@ -67,7 +67,7 @@ module.exports = async function shouldUseTaobao () {
       name: 'useTaobaoRegistry',
       type: 'confirm',
       message: chalk.yellow(
-        ` Your connection to the the default npm registry seems to be slow.\n` +
+        ` Your connection to the default npm registry seems to be slow.\n` +
           `   Use ${chalk.cyan(registries.taobao)} for faster installation?`
       )
     }