docs: fix scss example typo

yyx990803 · yyx990803 · commit a024513bcc27 · 2018-08-18T15:10:14.000-04:00
close vuejs#2272
diff --git a/docs/guide/css.md b/docs/guide/css.md
@@ -25,7 +25,7 @@ Then you can import the corresponding file types, or use them in `*.vue` files w
 
 ``` vue
 <style lang="scss">
-$color = red;
+$color: red;
 </style>
 ```
 
diff --git a/docs/ru/guide/css.md b/docs/ru/guide/css.md
@@ -25,7 +25,7 @@ npm install -D stylus-loader stylus
 
 ``` vue
 <style lang="scss">
-$color = red;
+$color: red;
 </style>
 ```
 
diff --git a/docs/zh/guide/css.md b/docs/zh/guide/css.md
@@ -25,7 +25,7 @@ npm install -D stylus-loader stylus
 
 ``` vue
 <style lang="scss">
-$color = red;
+$color: red;
 </style>
 ```
 
