fix PuTTY link in terminal.rst

[emanulato]

The link to PuTTY was pointing to putty.org. This domain has no relation to the PuTTY project! Instead, the website run by the actual PuTTY team can be found under https://putty.software , see https://hachyderm.io/@simontatham/115025974777386803

[jogomojo]

Thank you for the PR @emanulato...good find!

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.98%. Comparing base (19ed17d) to head (5929baf).
⚠️ Report is 5 commits behind head on image_v3.1.1.
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Additional details and impacted files

@@              Coverage Diff              @@
##           image_v3.1.1    #1502   +/-   ##
=============================================
  Coverage         34.98%   34.98%           
=============================================
  Files                30       30           
  Lines              4668     4668           
  Branches            818      818           
=============================================
  Hits               1633     1633           
  Misses             2975     2975           
  Partials             60       60           

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