docs: add note on pragma parsing

[pcaversaccio]

What I did

I add a note in the docs that both pragma directives #pragma and # pragma versions are supported. I deem this important as the previous version # @version also included a space. Furthermore, I fix a broken link for the PEP440 version specifiers.

How I did it

N/A.

How to verify it

N/A.

Commit message

docs: add note on pragma parsing

Description for the changelog

docs: add note on pragma parsing

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[codecov-commenter]

Codecov Report

Merging #3640 (b7f20f5) into master (5ca0cbf) will decrease coverage by 0.04%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##           master    #3640      +/-   ##
==========================================
- Coverage   89.13%   89.10%   -0.04%     
==========================================
  Files          86       86              
  Lines       11463    11463              
  Branches     2606     2606              
==========================================
- Hits        10218    10214       -4     
- Misses        826      830       +4     
  Partials      419      419              

see 1 file with indirect coverage changes

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