Update Backpressure.md

Author: mcxiaoke

topics/Backpressure.md

@@ -20,7 +20,7 @@ Cold Observables are ideal for the reactive pull model of backpressure described
 
 Your first line of defense against the problems of over-producing Observables is to use some of the ordinary set of Observable operators to reduce the number of emitted items to a more manageable number. The examples in this section will show how you might use such operators to handle a bursty Observable like the one illustrated in the following marble diagram:
 
-<img src="/images/roperators/bp.bursty.png" width="640" height="35" />​
+<img src="/images/operators/bp.bursty.png" width="640" height="35" />​
 
 By fine-tuning the parameters to these operators you can ensure that a slow-consuming observer is not overwhelmed by a fast-producing Observable.
 
@@ -182,4 +182,4 @@ Things that may need explaining:
 _**Work in progress...**_
 
 # See also
-* [RxJava 0.20.0-RC1 release notes](https://github.com/ReactiveX/RxJava/releases/tag/0.20.0-RC1)
+* [RxJava 0.20.0-RC1 release notes](https://github.com/ReactiveX/RxJava/releases/tag/0.20.0-RC1)