docs: clarify pattern usage with commands

[ghost]

Fixes: #5176

[ThomasWaldmann]

thanks for the PR, found some issues...

[codecov-commenter]

Codecov Report

Merging #5959 (85c0c34) into master (c6559f0) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5959      +/-   ##
==========================================
- Coverage   83.32%   83.30%   -0.02%     
==========================================
  Files          38       38              
  Lines       10359    10359              
  Branches     1710     1710              
==========================================
- Hits         8632     8630       -2     
- Misses       1221     1222       +1     
- Partials      506      507       +1     

Impacted Files	Coverage Δ
src/borg/archiver.py	80.26% <ø> (ø)
src/borg/archive.py	81.98% <0.00%> (-0.13%)	⬇️

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[ThomasWaldmann]

LGTM