Bug 1370343 - Update action task metadata to be more useful r=dustin

MozReview-Commit-ID: 2OAkAlA6sW4

--HG--
extra : rebase_source : 819cbc71229d52f0bf67b75ccee1755939007218

taskcluster/taskgraph/actions/add_new_jobs.py

@@ -19,7 +19,7 @@ from taskgraph.taskgraph import TaskGraph
     name='add-new-jobs',
     title='Add new jobs',
     symbol='add-new',
-    description="Add new jobs using task labels",
+    description="Add new jobs using task labels.",
     order=10000,
     context=[],
     schema={

taskcluster/taskgraph/actions/retrigger.py

@@ -12,7 +12,11 @@ from .registry import register_task_action
 @register_task_action(
     title='Retrigger',
     name='retrigger',
-    description='Create a clone of the task',
+    description=(
+        'Create a clone of the task.\n\n'
+        'This does not update any dependencies or '
+        'cause any downstream tasks to be retriggered.'
+    ),
     order=1,
     context=[{}],
 )

taskcluster/taskgraph/actions/run_missing_tests.py

@@ -22,14 +22,14 @@ logger = logging.getLogger(__name__)
     name='run-missing-tests',
     title='Run Missing Tests',
     symbol='rmt',
-    description="""
-    Run tests in the selected push that were optimized away, usually by SETA.
-
-    This action is for use on pushes that will be merged into another branch,
-    to check that optimization hasn't hidden any failures.
-    """,
+    description=(
+        "Run tests in the selected push that were optimized away, usually by SETA."
+        "\n"
+        "This action is for use on pushes that will be merged into another branch,"
+        "to check that optimization hasn't hidden any failures."
+    ),
     order=100,  # Useful for sheriffs, but not top of the list
-    context=[],  # Applies to any task
+    context=[],  # Applies to decision task
 )
 def run_missing_tests(parameters, input, task_group_id, task_id, task):
     decision_task_id = find_decision_task(parameters)