Fixed typos in rostopic FAQ

pps_wiki/faq.md

@@ -265,6 +265,7 @@ Common pitfalls to watch out for are:
 - If you advertise or subscribe to a topic from with a block of code enclosed by curly braces, for example:
 
 Common pitfalls to wathc out for are:
+
 - If there are two topics with a very similar name, then double check the spelling of the topic is identical in both the
 ```
 ros::Subscriber my_subscriber;