add paragraph added in #5855 to utility documentation source

[ghost]

I noticed the changes I did were to the generated files and not the original source. This should correct that.

[codecov-commenter]

Codecov Report

Merging #5861 (7b56105) into master (008ee01) will decrease coverage by 0.38%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5861      +/-   ##
==========================================
- Coverage   83.84%   83.46%   -0.39%     
==========================================
  Files          37       38       +1     
  Lines        9763    10353     +590     
  Branches     1621     1710      +89     
==========================================
+ Hits         8186     8641     +455     
- Misses       1104     1207     +103     
- Partials      473      505      +32     

Impacted Files	Coverage Δ
src/borg/archive.py	82.36% <ø> (-0.15%)	⬇️
src/borg/archiver.py	80.60% <ø> (-0.66%)	⬇️
src/borg/cache.py	85.74% <ø> (-0.51%)	⬇️
src/borg/constants.py	100.00% <ø> (ø)
src/borg/crypto/key.py	86.59% <ø> (+0.07%)	⬆️
src/borg/crypto/keymanager.py	91.01% <ø> (-0.16%)	⬇️
src/borg/fuse_impl.py	76.92% <ø> (ø)
src/borg/helpers/checks.py	40.74% <ø> (ø)
src/borg/helpers/datastruct.py	100.00% <ø> (ø)
src/borg/helpers/errors.py	100.00% <ø> (ø)
... and 43 more

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[ThomasWaldmann]

oops, missed that in review also. :-)

glad you noticed it.