Small docs change

[waynew]

See #320 - I did a quick audit and changed the couple of things that could use it. I did not confirm whether or not any of the code samples in the docs have any changes that are inconsistent with the current codebase... My hope is that they were already update and tested 😅

Anyway... this may or may not completely resolve #320.

[pepoluan]

A thot about that ... 🙃

[pepoluan]

I would split the piece of text explaining that we're replacement for smtpd into a separate paragraph, optionally with some kind of highlight / callout.

[webknjaz]

I enabled building PR previews @ RTD but it fails currently because the RTD config file needs to be updated: https://readthedocs.org/projects/aiosmtpd/builds/23289246/.

The GHA linting is failing is unrelated either, because of the unpinned flake8 plugin version, I suppose.

[webknjaz]

the RTD config file needs to be updated

Filed an issue for this with pointers: #393.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.12%. Comparing base (94710d8) to head (bb2d97f).
Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
- Coverage   98.14%   98.12%   -0.02%     
==========================================
  Files          22       22              
  Lines        5646     5646              
  Branches      755      755              
==========================================
- Hits         5541     5540       -1     
- Misses         68       70       +2     
+ Partials       37       36       -1     

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[webknjaz]

@waynew needs conflict resolution