Change TZT link to find other sellers

[tadeubas]

What is this PR for?

Update docs parts link to TZT
Follow-up PR from #822

Changes made to:

• Code
• Tests
• Docs
• CHANGELOG

Did you build the code and tested on device?

• Yes, build and tested on

What is the purpose of this pull request?

• Bug fix
• New feature
• Docs update
• Other

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.31%. Comparing base (5ae4ff5) to head (777720e).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #824   +/-   ##
========================================
  Coverage    97.31%   97.31%           
========================================
  Files           83       83           
  Lines        10568    10568           
========================================
  Hits         10284    10284           
  Misses         284      284           

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[joaozinhom]

ACK 777720e