Fix a few docstring typos in the tests

tests/SpiffWorkflow/specs/ExecuteTest.py

@@ -34,7 +34,7 @@ def testConstructor(self):
 
     def testPattern(self):
         """
-        Tests that we can create a task that executes an shell command
+        Tests that we can create a task that executes a shell command
         and that the workflow can be called to complete such tasks.
         """
         self.wf_spec.start.connect(self.spec)

tests/SpiffWorkflow/specs/TransformTest.py

@@ -26,7 +26,7 @@ def create_instance(self):
 
     def testPattern(self):
         """
-        Tests that we can create a task that executes an shell command
+        Tests that we can create a task that executes a shell command
         and that the workflow can be called to complete such tasks.
         """
         task1 = Transform(self.wf_spec, 'First', transforms=[

tests/SpiffWorkflow/specs/WorkflowSpecTest.py

@@ -93,7 +93,7 @@ def testSerialize(self):
 
     def testValidate(self):
         """
-        Tests that we can detect when two wait taks are waiting on each
+        Tests that we can detect when two wait tasks are waiting on each
         other.
         """
         task1 = Join(self.wf_spec, 'First')