[ao] Update ModelReport class with class usage in description. (#81251)
Summary: This adds a example usage description to the ModelReport class
so that people can see how it can be used right in the class
documentation without having to consult external sources. The example
usage depicts how it can be used using the QuantizationTracer, which was
a decision taken to illustrate how there is no strict requirement on
using this tool with only Fx Graph Mode workflow.
Test Plan: python test/test_quantization.py TestFxModelReportClass
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Pull Request resolved: https://github.com/pytorch/pytorch/pull/81251
Approved by: https://github.com/jerryzh168
