Update pip install docs with quoting when installing extras

[yunzheng]

• This is to ensure that the example works on all shells, for example zsh.
• Also added example on how to install pre-release packages.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.02%. Comparing base (3fb5f79) to head (c19148b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   75.02%   75.02%           
=======================================
  Files          11       11           
  Lines        2591     2591           
=======================================
  Hits         1944     1944           
  Misses        647      647           

Flag	Coverage Δ
unittests	75.02% <ø> (ø)

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