[PR #7343/18057581 backport][3.8] Mention encoding in yarl.URL

[patchback]

This is a backport of PR #7343 as merged into master (1805758).

Hopefully will reduce confusion for users (e.g. #7341).

[codecov]

Codecov Report

Merging #7355 (75d223a) into 3.8 (4087410) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              3.8    #7355   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files         107      107           
  Lines       30996    30996           
  Branches     3924     3924           
=======================================
+ Hits        30188    30189    +1     
+ Misses        604      603    -1     
  Partials      204      204           

Flag	Coverage Δ
CI-GHA	97.26% <ø> (+<0.01%)	⬆️
OS-Linux	96.89% <ø> (-0.01%)	⬇️
OS-Windows	95.23% <ø> (-0.01%)	⬇️
OS-macOS	96.66% <ø> (+0.01%)	⬆️
Py-3.10.11	94.84% <ø> (ø)
Py-3.10.12	96.49% <ø> (-0.04%)	⬇️
Py-3.11.0	96.21% <ø> (ø)
Py-3.6.15	96.38% <ø> (+<0.01%)	⬆️
Py-3.6.8	94.76% <ø> (-0.01%)	⬇️
Py-3.7.17	96.53% <ø> (ø)
Py-3.7.9	94.89% <ø> (ø)
Py-3.8.10	94.81% <ø> (ø)
Py-3.8.17	96.44% <ø> (ø)
Py-3.9.13	94.81% <ø> (-0.01%)	⬇️
Py-3.9.17	96.46% <ø> (ø)
Py-pypy7.3.11	93.95% <ø> (+<0.01%)	⬆️
VM-macos-latest	96.66% <ø> (+0.01%)	⬆️
VM-ubuntu-20.04	96.84% <ø> (-0.06%)	⬇️
VM-ubuntu-latest	96.43% <ø> (ø)
VM-windows-latest	95.23% <ø> (-0.01%)	⬇️

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see 2 files with indirect coverage changes

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