docs: update calibration diagram

[Edoardo-Pedicillo]

As the title says.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: main
  • Qibolab_platforms_qrc: main

[codecov]

Codecov Report

Merging #654 (ab0f6b7) into main (ae9d1e6) will decrease coverage by 0.06%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #654      +/-   ##
==========================================
- Coverage   96.09%   96.04%   -0.06%     
==========================================
  Files         106      106              
  Lines        7350     7350              
==========================================
- Hits         7063     7059       -4     
- Misses        287      291       +4     

Flag	Coverage Δ
unittests	96.04% <ø> (-0.06%)	⬇️

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see 1 file with indirect coverage changes