Fix unfinshed sentence in ShallowWrapper.contains() doc

docs/api/ShallowWrapper/contains.md

@@ -6,14 +6,14 @@ the one passed in.
 
 #### Arguments
 
-1. `node` (`ReactElement`): The node whose presence you are detecting in the current instance's 
-render tree. 
+1. `node` (`ReactElement`): The node whose presence you are detecting in the current instance's
+render tree.
 
 
 
 #### Returns
 
-`Boolean`: whether or not the current wrapper has a node anywhere in it's render tree that looks 
+`Boolean`: whether or not the current wrapper has a node anywhere in it's render tree that looks
 like the one passed in.
 
 
@@ -29,7 +29,7 @@ expect(wrapper.contains(<div className="foo bar" />)).to.equal(true);
 
 #### Common Gotchas
 
-- `.contains()` expects a ReactElement, not a selector (like many other methods). Make sure that 
-when you are calling it you are calling it with a 
-- Keep in mind that this method determines equality based on the equality of the node's children as 
+- `.contains()` expects a ReactElement, not a selector (like many other methods). Make sure that
+when you are calling it you are calling it with a ReactElement or a JSX expression.
+- Keep in mind that this method determines equality based on the equality of the node's children as
 well.