docs: add missing slog option

[alexandear]

This PR adds the missing slog option to disable list and to the Doc.

slog was added in #72.

[timonwong]

LGTM, thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.78%. Comparing base (1e493f8) to head (26969f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #99   +/-   ##
=======================================
  Coverage   98.78%   98.78%           
=======================================
  Files          13       13           
  Lines         577      577           
=======================================
  Hits          570      570           
  Misses          5        5           
  Partials        2        2           

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