Argon2: documentation and changelog

[hexagonrecursion]

fix #6539

[codecov-commenter]

Codecov Report

Merging #6560 (ccbfa66) into master (28fa9e0) will decrease coverage by 0.16%.
The diff coverage is n/a.

❗ Current head ccbfa66 differs from pull request most recent head 47c4bf3. Consider uploading reports for the commit 47c4bf3 to get more accurate results

@@            Coverage Diff             @@
##           master    #6560      +/-   ##
==========================================
- Coverage   82.92%   82.76%   -0.17%     
==========================================
  Files          39       39              
  Lines       10650    10650              
  Branches     2089     2089              
==========================================
- Hits         8832     8814      -18     
- Misses       1307     1321      +14     
- Partials      511      515       +4     

Impacted Files	Coverage Δ
src/borg/archiver.py	78.50% <ø> (+0.03%)	⬆️
src/borg/platform/__init__.py	72.00% <0.00%> (-12.00%)	⬇️
src/borg/platform/base.py	77.69% <0.00%> (-3.08%)	⬇️
src/borg/helpers/misc.py	77.09% <0.00%> (-1.68%)	⬇️
src/borg/helpers/passphrase.py	76.53% <0.00%> (-1.35%)	⬇️
src/borg/xattr.py	50.00% <0.00%> (-1.20%)	⬇️
src/borg/helpers/fs.py	80.47% <0.00%> (-1.19%)	⬇️
src/borg/archive.py	81.40% <0.00%> (-0.38%)	⬇️
src/borg/crypto/key.py	91.96% <0.00%> (-0.13%)	⬇️

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[ThomasWaldmann]

some more nitpicks

[ThomasWaldmann]

thanks!