Merge pull request #2160 from pReya/patch-1

Use syntax highlighting for examples in "no-access-state-in-setstate"

docs/rules/no-access-state-in-setstate.md

@@ -5,7 +5,7 @@ Such usage of `this.state` might result in errors when two state calls are
 called in batch and thus referencing old state and not the current
 state. An example can be an increment function:
 
-```
+```javascript
 function increment() {
   this.setState({value: this.state.value + 1});
 }
@@ -14,15 +14,15 @@ function increment() {
 If these two `setState` operations is grouped together in a batch it will
 look be something like the following, given that value is 1:
 
-```
+```javascript
 setState({value: 1 + 1})
 setState({value: 1 + 1})
 ```
 
 This can be avoided with using callbacks which takes the previous state
 as first argument:
 
-```
+```javascript
 function increment() {
   this.setState(prevState => ({value: prevState.value + 1}));
 }
@@ -33,7 +33,7 @@ even when things happen in batches. And the example above will be
 something like:
 
 
-```
+```javascript
 setState({value: 1 + 1})
 setState({value: 2 + 1})
 ```