added synched sequences

gallery/example2.typ

@@ -48,4 +48,39 @@
   _seq("Alice", "]", comment: [->\]\ from actor1 *to end*])
   _seq("Alice", "?", comment: [->?\ *short* from actor1])
   _seq("Alice", "Bob", comment: [->\ from actor1 to actor2])
+})
+
+#chronos.diagram({
+  import chronos: *
+  _par("alice", display-name: "Alice")
+  _par("bob", display-name: "Bob")
+  _par("craig", display-name: "Craig")
+
+  _seq("bob", "alice")
+  _seq("bob", "craig")
+  _gap()
+  
+  _sync({
+    _seq("bob", "alice")
+    _seq("bob", "craig")
+  })
+  _gap()
+  
+  _seq("alice", "bob")
+  _seq("craig", "bob")
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob")
+    _seq("craig", "bob")
+  })
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob", enable-dst: true)
+    _seq("craig", "bob")
+  })
+  _gap()
+
+  _evt("bob", "disable")
 })