[3.6] Add minimal logging config to the documentation (#4087)

[asvetlov]

(cherry picked from commit 31ef9e1)

Co-authored-by: Alexey Dobrushskiy [email protected]

[codecov-io]

Codecov Report

Merging #4088 into 3.6 will decrease coverage by 0.33%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##            3.6    #4088      +/-   ##
========================================
- Coverage    98%   97.66%   -0.34%     
========================================
  Files        44       44              
  Lines      8831     8831              
  Branches   1387     1387              
========================================
- Hits       8655     8625      -30     
- Misses       71       97      +26     
- Partials    105      109       +4

Impacted Files	Coverage Δ
aiohttp/http_parser.py	93.11% <0%> (-4.82%)	⬇️
aiohttp/http_writer.py	95.28% <0%> (-2.84%)	⬇️
aiohttp/frozenlist.py	97.87% <0%> (-2.13%)	⬇️
aiohttp/web_fileresponse.py	96.59% <0%> (-1.14%)	⬇️
aiohttp/connector.py	97.43% <0%> (-0.33%)	⬇️
aiohttp/helpers.py	96.5% <0%> (-0.25%)	⬇️

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