docs: Correct 2 minor grammar errors. (#2378)

Author: rowild

docs/guide/webpack.md

@@ -123,7 +123,7 @@ module.exports = {
 }
 ```
 
-You will need to familiarize yourself with [webpack-chain's API](https://github.com/mozilla-neutrino/webpack-chain#getting-started) and [read some source code](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-service/lib/config) in order to understand how to leverage the full power of this option, but it gives you a more expressive and safer way to modify the webpack config than directly mutation values.
+You will need to familiarize yourself with [webpack-chain's API](https://github.com/mozilla-neutrino/webpack-chain#getting-started) and [read some source code](https://github.com/vuejs/vue-cli/tree/dev/packages/%40vue/cli-service/lib/config) in order to understand how to leverage the full power of this option, but it gives you a more expressive and safer way to modify the webpack config than directly mutate values.
 
 For example, say you want to change the default location of `index.html` from `/Users/username/proj/public/index.html` to `/Users/username/proj/app/templates/index.html`. By referencing [html-webpack-plugin](https://github.com/jantimon/html-webpack-plugin#options) you can see a list of options you can pass in. To change our template path we can pass in a new template path with the following config:
 
@@ -182,7 +182,7 @@ vue inspect --plugins
 
 ## Using Resolved Config as a File
 
-Some external tools may need access to the resolved webpack config as a file, for example IDEs or command line tools that expects a webpack config path. In that case you can use the following path:
+Some external tools may need access to the resolved webpack config as a file, for example IDEs or command line tools that expect a webpack config path. In that case you can use the following path:
 
 ```
 <projectRoot>/node_modules/@vue/cli-service/webpack.config.js