Improve API docs

[ahopkins]

Overall improvements to the API docs

[codecov]

Codecov Report

Merging #2488 (ce63b7b) into main (b59da49) will decrease coverage by 0.029%.
The diff coverage is 89.473%.

@@              Coverage Diff              @@
##              main     #2488       +/-   ##
=============================================
- Coverage   87.535%   87.506%   -0.030%     
=============================================
  Files           69        69               
  Lines         5584      5587        +3     
  Branches       973       974        +1     
=============================================
+ Hits          4888      4889        +1     
- Misses         505       506        +1     
- Partials       191       192        +1     

Impacted Files	Coverage Δ
sanic/http/http1.py	86.619% <ø> (ø)
sanic/http/http3.py	82.022% <ø> (ø)
sanic/request.py	95.514% <84.615%> (-0.507%)	⬇️
sanic/app.py	88.783% <100.000%> (ø)
sanic/http/__init__.py	100.000% <100.000%> (ø)
sanic/log.py	100.000% <100.000%> (ø)

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