Description for REGISTER_VERIFICATION_ONE_TIME_USE

[GuglielmoFelici]

Based on this message

Checklist

• I read Contribution Guidelines
• I ran the checks and the tests (make check && make test) before submitting the PR on my branch and they passed
• I attached unit tests testing the provided code so the code coverage will not drop below 98%

Didn't run the checks as the commands don't work out of the box and can't spend too much time on this. Feel free to run them on your machine or discard the PR.

Description

Add description to the REGISTER_VERIFICATION_ONE_TIME_USE setting, based on the maintainer's message linked above

Why the change is needed?

Everyone loves documentation!

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.35%. Comparing base (ac9459c) to head (54834bb).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #312   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files          44       44           
  Lines        1583     1583           
  Branches      157      157           
=======================================
  Hits         1557     1557           
  Misses         16       16           
  Partials       10       10           

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