docs: fix grammar in css.md (vuejs#3598) [ci skip]

jbruni · haoqunjiang · commit a1b784fe7dac · 2019-03-17T02:11:16.000+08:00
diff --git a/docs/guide/css.md b/docs/guide/css.md
@@ -136,7 +136,7 @@ module.exports = {
 }
 ```
 
-Loaders can be configured via `loaderOptions` include:
+Loaders which can be configured via `loaderOptions` include:
 
 - [css-loader](https://github.com/webpack-contrib/css-loader)
 - [postcss-loader](https://github.com/postcss/postcss-loader)

Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,7 @@ module.exports = {`
`136`	`136`	`}`
`137`	`137`	```
`138`	`138`
`139`		-Loaders can be configured via `loaderOptions` include:
	`139`	+Loaders which can be configured via `loaderOptions` include:
`140`	`140`
`141`	`141`	`- [css-loader](https://github.com/webpack-contrib/css-loader)`
`142`	`142`	`- [postcss-loader](https://github.com/postcss/postcss-loader)`