update docs

Author: geof90

README.md

@@ -345,7 +345,7 @@ public class MainActivity extends ReactActivity {
 
 #### Background React Instances
 
-*This section is only necessary if you're **explicitly** launching a React Native instance without an `Activity` (for example, from within a native push notification receiver). For these situations, CodePush must be told how to find your React Native instance.*
+*This section is only necessary if you're <b>explicitly</b> launching a React Native instance without an `Activity` (for example, from within a native push notification receiver). For these situations, CodePush must be told how to find your React Native instance.*
 
 In order to update/restart your React Native instance, CodePush must be configured with a `ReactInstanceHolder` before attempting to restart an instance in the background. This is usually done in your `Application` implementation.