docs/format: detail array_length is in number of elements

[alxsimon]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.30%. Comparing base (0ca5c81) to head (24c48e9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #247   +/-   ##
=======================================
  Coverage   91.30%   91.30%           
=======================================
  Files           8        8           
  Lines        1346     1346           
  Branches      194      194           
=======================================
  Hits         1229     1229           
  Misses        106      106           
  Partials       11       11           

Flag	Coverage Δ
C	98.28% <ø> (ø)
c-python	60.60% <ø> (ø)
python-tests	99.31% <ø> (ø)

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

Components	Coverage Δ
Python API	99.54% <ø> (ø)
Python C interface	60.60% <ø> (ø)
C library	98.28% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.