Fix typo in system_design.typ (#56)

content/system_design.typ

@@ -15,9 +15,9 @@
   Derive design goals from your nonfunctional requirements, prioritize them (as they might conflict with each other) and describe the rationale of your prioritization. Any trade-offs between design goals (e.g., build vs. buy, memory space vs. response time), and the rationale behind the specific solution should be described in this section
 ]
 
-== Subsytem Decomposition
+== Subsystem Decomposition
 #TODO[
-  Describe the architecture of your system by decomposing it into subsys- tems and the services provided by each subsystem. Use UML class diagrams including packages / components for each subsystem.
+  Describe the architecture of your system by decomposing it into subsystems and the services provided by each subsystem. Use UML class diagrams including packages / components for each subsystem.
 ]
 
 == Hardware Software Mapping
@@ -43,4 +43,4 @@
 == Boundry Conditions
 #TODO[
   Optional section describing the use cases how to start up the separate components of the system, how to shut them down, and what to do if a component or the system fails.
-]
+]