Clarify middleware splitting vs. endpoints

[cmeeren]

Addresses #6894

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8717279) 73.18% compared to head (30e1a31) 73.28%.

:exclamation: Current head 30e1a31 differs from pull request most recent head 42f0edf. Consider uploading reports for the commit 42f0edf to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6898      +/-   ##
==========================================
+ Coverage   73.18%   73.28%   +0.10%     
==========================================
  Files        2568     2582      +14     
  Lines      127558   128194     +636     
==========================================
+ Hits        93355    93949     +594     
- Misses      34203    34245      +42     

Flag	Coverage Δ
unittests	73.28% <ø> (+0.10%)	:arrow_up:

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