Update docs to about default ACCESS_TOKEN_EXPIRE_SECONDS

[damaestro]

Description of the Change

This PR adds to the documentation details of the access token expires and a stronger suggestion to expire refresh tokens.

Checklist

• PR only contains one change (considered splitting up PR)
• documentation updated

[codecov]

Codecov Report

Merging #917 (64a461b) into master (ca90e8f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #917   +/-   ##
=======================================
  Coverage   95.04%   95.04%           
=======================================
  Files          25       25           
  Lines        1070     1070           
=======================================
  Hits         1017     1017           
  Misses         53       53           

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[n2ygk]

Thanks for the improvement!