Use NOT notation in task tests instead of "-"

Use the more explicit and clearer "NOT" query notation.

Change-Id: If0268680219bff73443f24cca5f3ce5d8c1cbae1
diff --git a/src/main/resources/Documentation/task_states.md b/src/main/resources/Documentation/task_states.md
index 3ab312c..5b8ac13 100644
--- a/src/main/resources/Documentation/task_states.md
+++ b/src/main/resources/Documentation/task_states.md
@@ -53,7 +53,7 @@
 
 [root "Root READY (subtask PASS)"]
   applicable = is:open
-  pass = -is:open
+  pass = NOT is:open
   subtask = Subtask PASS
   ready-hint = You must now run the ready task
 
@@ -70,12 +70,12 @@
 [root "Root IN PROGRESS"]
    applicable = is:open
    in-progress = is:open
-   pass = -is:open
+   pass = NOT is:open
 
 [root "Root NOT IN PROGRESS"]
    applicable = is:open
-   in-progress = -is:open
-   pass = -is:open
+   in-progress = NOT is:open
+   pass = NOT is:open
 
 [root "Subtasks File"]
   subtasks-file = common.config
@@ -132,7 +132,7 @@
 
 [task "Subtask READY"]
   applicable = is:open
-  pass = -is:open
+  pass = NOT is:open
   subtask = Subtask PASS
 
 [task "Subtask PASS"]
diff --git a/test/root.change b/test/root.change
index 3ca43aa..99dea09 100644
--- a/test/root.change
+++ b/test/root.change
@@ -6,7 +6,7 @@
 
 [root "Root READY (subtask PASS) Preview"]
   applicable = is:open
-  pass = -is:open
+  pass = NOT is:open
   subtask = Subtask PASS Preview
   ready-hint = You must now run the ready task
 
@@ -14,11 +14,11 @@
   subtasks-external = user special Preview
 
 [root "Root NA Pass Preview"]
-  applicable = -is:open
+  applicable = NOT is:open
   pass = True
 
 [root "NA INVALIDS Preview"]
-  applicable = -is:open
+  applicable = NOT is:open
   subtasks-file = invalids.config
 
 [task "Subtask PASS Preview"]