docs: remove the closed discussion link

[Nick17t]

Goals:

• ...
• ...
• check and update documentation, if required. See guide

[codecov]

Codecov Report

Merging #442 (6a9feda) into main (d16f10e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #442   +/-   ##
=======================================
  Coverage   86.59%   86.59%           
=======================================
  Files         134      134           
  Lines        6477     6477           
=======================================
  Hits         5609     5609           
  Misses        868      868           

Flag	Coverage Δ
docarray	86.59% <100.00%> (ø)

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Impacted Files	Coverage Δ
docarray/__init__.py	75.00% <100.00%> (ø)

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