Autozi userguide

[galenxing]

Closes #1171

[codecov]

Codecov Report

Merging #1204 (dbdee5c) into master (9ba2794) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   90.67%   90.67%           
=======================================
  Files          95       95           
  Lines        7687     7687           
=======================================
  Hits         6970     6970           
  Misses        717      717           

Impacted Files	Coverage Δ
scvi/module/_amortizedlda.py	100.00% <0.00%> (ø)
scvi/train/_trainingplans.py	95.88% <0.00%> (ø)

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