[Telemetry] Style fix, make docstrings consistent with style guide.

tools/telemetry/telemetry/timeline/sample.py

Index: tools/telemetry/telemetry/timeline/sample.py
diff --git a/tools/telemetry/telemetry/timeline/sample.py b/tools/telemetry/telemetry/timeline/sample.py
index 002d294d0ce9c3093bf5e5e5b8b1154dca0c49bd..806f60fafa2635a581485698ceee0eed38121471 100644
--- a/tools/telemetry/telemetry/timeline/sample.py
+++ b/tools/telemetry/telemetry/timeline/sample.py
@@ -6,14 +6,14 @@ import telemetry.timeline.event as timeline_event
 
 
 class Sample(timeline_event.TimelineEvent):
-  ''' A Sample represents a sample taken at an instant in time
+  """A Sample represents a sample taken at an instant in time
   plus parameters associated with that sample.
 
   NOTE: The Sample class implements the same interface as
   Slice. These must be kept in sync.
 
   All time units are stored in milliseconds.
-  '''
+  """
   def __init__(self, parent_thread, category, name, timestamp, args=None):
     super(Sample, self).__init__(
         category, name, timestamp, 0, args=args)