chore: fix hint on building docarray proto

[samsja]

Context

fix a typo in the proto building hint

Signed-off-by: samsja 55492238+samsja@users.noreply.github.com

[codecov]

Codecov Report

Merging #711 (4f0ee58) into main (92cc8b3) will decrease coverage by 2.56%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #711      +/-   ##
==========================================
- Coverage   88.10%   85.53%   -2.57%     
==========================================
  Files         133      133              
  Lines        6538     6538              
==========================================
- Hits         5760     5592     -168     
- Misses        778      946     +168     

Flag	Coverage Δ
docarray	85.53% <ø> (-2.57%)	⬇️

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

Impacted Files	Coverage Δ
docarray/array/mixins/plot.py	28.13% <0.00%> (-39.83%)	⬇️
docarray/array/mixins/getattr.py	60.60% <0.00%> (-21.22%)	⬇️
docarray/array/queryset/parser.py	68.33% <0.00%> (-20.00%)	⬇️
docarray/array/mixins/io/csv.py	71.05% <0.00%> (-18.43%)	⬇️
docarray/array/mixins/setitem.py	64.16% <0.00%> (-18.34%)	⬇️
docarray/array/mixins/delitem.py	75.55% <0.00%> (-13.34%)	⬇️
docarray/array/mixins/getitem.py	79.36% <0.00%> (-11.12%)	⬇️
docarray/array/storage/base/getsetdel.py	85.81% <0.00%> (-5.41%)	⬇️
docarray/array/storage/weaviate/getsetdel.py	94.73% <0.00%> (-5.27%)	⬇️
docarray/array/storage/elastic/getsetdel.py	96.61% <0.00%> (-3.39%)	⬇️
... and 3 more

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