Fix duplicate note and while we're at it some typos under docs/

[lucasmrod]

Fixing the following duplicate note in docs/Configuration/yaml-files.md:

And while we're at it... fixing some typos under docs/.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.03%. Comparing base (2cb83a1) to head (6e77397).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32575   +/-   ##
=======================================
  Coverage   64.02%   64.03%           
=======================================
  Files        1987     1987           
  Lines      195630   195630           
  Branches     6550     6550           
=======================================
+ Hits       125251   125266   +15     
+ Misses      60575    60562   -13     
+ Partials     9804     9802    -2     

Flag	Coverage Δ
backend	65.25% <ø> (+<0.01%)	⬆️

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