User documentation: various minor improvements

plugins/org.yakindu.sct.doc.user/help/03_Tasks/tasks.textile

@@ -142,4 +142,4 @@ The SGraph meta model defines the structural aspects of the Statechart model and
 * *Entry* is a __Pseudostate__ with the additional attribute __kind__. An __Entry__ may be of the kind __Initial__, __ShallowHistory__ or __DeepHistory__.
 * *Exit* is a __Pseudostate__. It is defined as the point where a region is left.
 * *Synchronization* is a __Pseudostate__. It is equivalent to a __Fork__ and to a __Join__.
-* *Transition* is defined as a directed relationship between two vertices.
+* *Transition* is defined as a directed relationship between two vertices.