Update activity diagram

docs/diagrams/CommitActivityDiagram.puml

@@ -3,22 +3,23 @@ skin rose
 skinparam ActivityFontSize 15
 skinparam ArrowFontSize 12
 start
-:User executes command;
+:User inputs and
+executes command;
 
 'Since the beta syntax does not support placing the condition outside the
 'diamond we place it as the true branch instead.
-
-if () then ([command modifies CampusConnect])
-    :Purge undone states in the
-    "future" stack;
-    :Save current CampusConnect
-    to "history" stack;
+: Parse command;
+if () then ([command will modify CampusConnect])
+    :Purge undone states;
+    :Save current CampusConnect;
+    :Excutes Command;
     if () then ([command execution fails])
-    : Undo old version of
+    : Recover to old version of
     CampusConnect;
     else ([else])
     endif
 else ([else])
+:Excutes Command;
 endif
 stop
 @enduml