Refactor quant levels visualization (#82790)
### Summary
Refactors quantization levels visualization function to include alpha qparam in parameters of `float_to_apot` function call (due to `float_to_apot` function update). Also adds additional detail to the documentation for `quant_levels_visualization`.
### Test Plan
Print visualization by calling `quant_levels_visualization` function.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/82790
Approved by: https://github.com/jerryzh168
