fix: the installation instruction had a missing step

[dicaeffe]

Why are these changes needed?

Following the guide instructions the user will execute the commands in the wrong directory.

Related issue number

Closes #6165

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.16%. Comparing base (20753ad) to head (f2fe459).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6166       +/-   ##
===========================================
- Coverage   77.08%   30.16%   -46.93%     
===========================================
  Files         197      101       -96     
  Lines       13637     8036     -5601     
===========================================
- Hits        10512     2424     -8088     
- Misses       3125     5612     +2487     

Flag	Coverage Δ
unittests	30.16% <ø> (-46.93%)	⬇️

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