Documentation for current autograph support and sharp bits (#6678)

- Updates docstring for `make_plxpr`, 
- adds `run_autograph` to the capture module docs page 
- gives `run_autograph` a more comprehensive docstring, and 
- adds a sharp-bits guide for Autograph (currently only linked through
the `make_plxpr` and `run_autograph` docstring)

[sc-71827]

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Co-authored-by: andrijapau <[email protected]>
Co-authored-by: Christina Lee <[email protected]>
Co-authored-by: Mudit Pandey <[email protected]>
Co-authored-by: Pietropaolo Frisoni <[email protected]>
Co-authored-by: Yushao Chen (Jerry) <[email protected]>
Co-authored-by: Isaac De Vlugt <[email protected]>
Co-authored-by: Josh Izaac <[email protected]>