fix: typo in tutorial

Author: zaucy

src/app/start/tutorials/systems-in-cpp/systems-in-cpp.component.html

@@ -120,7 +120,7 @@ <h2 id="system-impl">System Implementation</h2>
 		<h3 id="write-the-impl">Writing the implementation</h3>
 		<p>
 			Okay now that we've talked about the relevant generated C++ we can start
-			writing our implementation. The <code>context</code> parameter of the C++ implementation contains all the functionality the system is allows to access.
+			writing our implementation. The <code>context</code> parameter of the C++ implementation contains all the functionality the system is allowed to access.
 		</p>
 
 		<p>