doc: hex literals for Bytes no longer allowed

[charles-cooper]

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[codecov-commenter]

Codecov Report

Merging #2736 (cd40c30) into master (5dcd8a7) will decrease coverage by 0.57%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2736      +/-   ##
==========================================
- Coverage   87.23%   86.65%   -0.58%     
==========================================
  Files          93       93              
  Lines        9893     9893              
  Branches     2470     2470              
==========================================
- Hits         8630     8573      -57     
- Misses        781      831      +50     
- Partials      482      489       +7     

Impacted Files	Coverage Δ
vyper/builtin_functions/functions.py	85.89% <0.00%> (-4.74%)	⬇️
vyper/semantics/types/value/numeric.py	80.45% <0.00%> (-4.60%)	⬇️
vyper/ast/nodes.py	92.49% <0.00%> (-1.65%)	⬇️

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