Enhance TimingHandler class documentation comment

[Somesh-Kennedy]

Fixes # .

Added docstring (enhanced the comment) for TimingHandler class, detailing attributes and example data structure.

Summary/Motivation:

Increasing the understandability of the code (for the whole TimingHandler class)

Changes proposed in this PR:

• added an example attribute in the comment in order to understand the returned object.

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[mrmundt]

I was looking over the class to make sure these changes are accurate, and I think enabled doesn't actually do anything. It's set in __init__ but... then is never used again. Which leads me to believe that maybe we should just remove enabled (and this line from the docs).