Update reference-react.md (reactjs#276)

yuyokk · gaearon · commit da283ec8ff6c · 2017-11-12T18:51:34.000Z
Hi guys,

I was reading docs on `React.Children.only()` method and saw this statement `Otherwise this method throws.` and it seemed a bit unclear for me what it supposed to throw.

Please let me know if this PR makes sense.

Thank you!
diff --git a/content/docs/reference-react.md b/content/docs/reference-react.md
@@ -175,7 +175,7 @@ Returns the total number of components in `children`, equal to the number of tim
 React.Children.only(children)
 ```
 
-Verifies that `children` has only one child (a React element) and returns it. Otherwise this method throws.
+Verifies that `children` has only one child (a React element) and returns it. Otherwise this method throws an error.
 
 > Note:
 >

Original file line number	Diff line number	Diff line change
@@ -175,7 +175,7 @@ Returns the total number of components in `children`, equal to the number of tim
`175`	`175`	`React.Children.only(children)`
`176`	`176`	```
`177`	`177`
`178`		-Verifies that `children` has only one child (a React element) and returns it. Otherwise this method throws.
	`178`	+Verifies that `children` has only one child (a React element) and returns it. Otherwise this method throws an error.
`179`	`179`
`180`	`180`	`> Note:`
`181`	`181`	`>`