typos (#2776)

Author: The Jared Wilcurt

packages/@vue/babel-preset-app/index.js

@@ -127,8 +127,8 @@ module.exports = (context, options = {}) => {
   presets.push([require('@babel/preset-env'), envOptions])
 
   // additional <= stage-3 plugins
-  // Babel 7 is removing stgage presets altogether because people are using
-  // too much unstable proposals. Let's be conservative in the defaults here.
+  // Babel 7 is removing stage presets altogether because people are using
+  // too many unstable proposals. Let's be conservative in the defaults here.
   plugins.push(
     require('@babel/plugin-syntax-dynamic-import'),
     [require('@babel/plugin-proposal-decorators'), { legacy: decoratorsLegacy !== false }],