removed autosummary from linen docs

[chiamp]

On the Linen API table of contents, there are duplicate entries because of autosummary:

This PR removes autosummary from the Linen API reference so that the table of contents won't contain duplicate entries. As a consequence, this will remove the summary table at the end of the page for every API reference, for example in Init/Apply:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.62%. Comparing base (6f1f1ef) to head (219c704).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3792   +/-   ##
=======================================
  Coverage   59.62%   59.62%           
=======================================
  Files         101      101           
  Lines       12655    12655           
=======================================
  Hits         7546     7546           
  Misses       5109     5109           

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