Add documentation to generate the token

[gaiksaya]

Description

Add documentation to generate the token for 1-click release process.

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

Merging #3918 (88fc4be) into main (e89bd43) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3918   +/-   ##
=======================================
  Coverage   92.05%   92.05%           
=======================================
  Files         187      187           
  Lines        5667     5667           
=======================================
  Hits         5217     5217           
  Misses        450      450           

[peterzhuamazon]

Note that -30 can be change to other number as well, but it must be a number so limited lines will be retrieved as base.

Also, try to use urandom all the time instead of the random one as the former one is more robust, efficient, and random.

Thanks.