Fixing a syntax error in qualityofservice.rst (ThreeMammals#691)

docs/features/qualityofservice.rst

@@ -2,7 +2,7 @@ Quality of Service
 ==================
 
 Ocelot supports one QoS capability at the current time. You can set on a per ReRoute basis if you 
-want to use a circuit breaker when making requests to a downstream service. This uses the an awesome
+want to use a circuit breaker when making requests to a downstream service. This uses an awesome
 .NET library called Polly check them out `here <https://github.com/App-vNext/Polly>`_.
 
 The first thing you need to do if you want to use the administration API is bring in the relavent NuGet package..
@@ -45,4 +45,4 @@ You can set the TimeoutValue in isoldation of the ExceptionsAllowedBeforeBreakin
 There is no point setting the other two in isolation as they affect each other :)
 
 If you do not add a QoS section QoS will not be used however Ocelot will default to a 90 second timeout 
-on all downstream requests. If someone needs this to be configurable open an issue.
+on all downstream requests. If someone needs this to be configurable open an issue.