Correct type of metadata array attribute in struct metadata docs

[hyanwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.62%. Comparing base (8caf830) to head (f1e0094).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3185   +/-   ##
=======================================
  Coverage   89.62%   89.62%           
=======================================
  Files          28       28           
  Lines       31969    31969           
  Branches     5873     5873           
=======================================
  Hits        28653    28653           
  Misses       1886     1886           
  Partials     1430     1430           

Flag	Coverage Δ
c-tests	86.66% <ø> (ø)
lwt-tests	80.38% <ø> (ø)
python-c-tests	88.18% <ø> (ø)
python-tests	98.85% <ø> (ø)

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