fixed a typo

articles/intraprocess_communication.md

@@ -133,7 +133,7 @@ The executor can then pop the message from the buffer and trigger the callback o
 The choice of having independent buffers for each `Subscription` leads to the following advantages:
 
  - It is easy to support different QoS for each `Subscription`, while, at the same time, simplifying the implementation.
- - Multiple `Subscription`s can extract messages from their own buffer in parallel without blocking each other, thus providing an higher throughput.
+ - Multiple `Subscription`s can extract messages from their own buffer in parallel without blocking each other, thus providing a higher throughput.
 
 The only drawback is that the system is not reusing as much resources as possible, compared to sharing buffers between entities.
 However, from a practical point of view, the memory overhead caused by the proposed implementation with respect to the current one, will always be only a tiny delta compared to the overall memory usage of the application.