docs improve load_file

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Improve

https://aiopenapi3.readthedocs.io/en/latest/api.html#aiopenapi3.OpenAPI.load_file

to

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.54%. Comparing base (53d25fe) to head (366e668).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #395      +/-   ##
==========================================
+ Coverage   94.51%   94.54%   +0.02%     
==========================================
  Files          88       88              
  Lines        7479     7479              
==========================================
+ Hits         7069     7071       +2     
+ Misses        410      408       -2     

Flag	Coverage Δ
core	94.54% <ø> (+0.02%)	⬆️
extras	94.54% <ø> (+0.02%)	⬆️

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