Fix protocols documentation generation

[andrea-pasquale]

The protocols were not shown correctly in the documentation.
This PR fixes the issue. We could start from here to improve the documentation.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 97.28%. Comparing base (6633379) to head (48c5429).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #854      +/-   ##
==========================================
- Coverage   97.30%   97.28%   -0.03%     
==========================================
  Files         107      107              
  Lines        7915     7915              
==========================================
- Hits         7702     7700       -2     
- Misses        213      215       +2     

Flag	Coverage Δ
unittests	97.28% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
src/qibocal/auto/task.py	99.13% <100.00%> (ø)
src/qibocal/fitting/classifier/qubit_fit.py	100.00% <100.00%> (ø)
src/qibocal/protocols/__init__.py	100.00% <ø> (ø)
src/qibocal/protocols/allxy/allxy.py	100.00% <ø> (ø)
...qibocal/protocols/allxy/allxy_drag_pulse_tuning.py	100.00% <ø> (ø)
src/qibocal/protocols/classification.py	100.00% <100.00%> (ø)
src/qibocal/protocols/coherence/spin_echo.py	95.12% <ø> (ø)
...rc/qibocal/protocols/coherence/spin_echo_signal.py	100.00% <ø> (ø)
src/qibocal/protocols/coherence/t1.py	93.93% <ø> (ø)
src/qibocal/protocols/coherence/t1_sequences.py	100.00% <ø> (ø)
... and 71 more