Ch. 17: fix task names in Figure 17-2

Author: chriskrycho

dot/trpl17-02.dot

@@ -1,25 +1,25 @@
 digraph {
    dpi = 300.0;
-
+   
    rankdir = "LR";
    splines = false;
    cluster = true;
-
+   
    node [shape = diamond;];
-
+   
    // The graphs end up with the correct order, i.e. Task 1 *above* Task 2, when
    // this is first.
    subgraph cluster_ColleagueB {
-      label = "Task 2";
+      label = "Task B";
       B1 -> B2 -> B3;
-
+      
       B0 [style = invis;];
-      B3 -> B0 [style = invis;]
+      B3 -> B0 [style = invis;];
    }
-
+   
    subgraph cluster_ColleagueA {
       newrank = true;
-      label = "Task 1";
+      label = "Task A";
       A1 -> A2 -> A3 -> A4;
    }
-}
+}