Docs: remove mention of 12v for printer power supply

[tadeubas]

Description

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.15%. Comparing base (981b215) to head (1aca7c0).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #443   +/-   ##
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  Coverage    94.15%   94.15%           
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  Files           58       58           
  Lines         7189     7189           
========================================
  Hits          6769     6769           
  Misses         420      420           

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[odudex]

12V printers are compatible with Krux, and users have the option to choose them. This is not a plug-and-play feature and requires basic electronics knowledge, the understanding of specs, allowed voltage ranges, etc. It's important not to remove this information to avoid misleading users into thinking that 12V models cannot be used.