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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[blnicho]

@Somesh-Kennedy we discussed this at the dev call and decided to close this without merging. We don't think documenting a private attribute in an untested example script meets the minimum threshold of "usefulness" we expect from PRs. If you disagree with our decision please reach out or leave a comment.