Fixes syntax typo in DirectManipulation section of docs

Summary:
Fixing JSX tag in DirectManipulation section of the docs
Closes #7622

Differential Revision: D3321130

fbshipit-source-id: e315529dc94c88597e4855a63ba6931301d4dba7

Author: tegon

docs/DirectManipulation.md

@@ -49,7 +49,7 @@ any knowledge of that fact or requiring any changes to its implementation:
   <View style={styles.button}>
     <Text>Press me!</Text>
   </View>
-<TouchableOpacity>
+</TouchableOpacity>
 ```
 
 Let's imagine that `setNativeProps` was not available. One way that we