server: explain more aboud MaxRoutines option

[tocrafty]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cf5ca25) 85.80909% compared to head (46b4334) 85.39974%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@                 Coverage Diff                 @@
##                main        #137         +/-   ##
===================================================
- Coverage   85.80909%   85.39974%   -0.40936%     
===================================================
  Files            189         189                 
  Lines          16123       16123                 
===================================================
- Hits           13835       13769         -66     
- Misses          1736        1790         +54     
- Partials         552         564         +12     

Flag	Coverage Δ
unittests	85.39974% <ø> (-0.40936%)	⬇️

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Files	Coverage Δ
config.go	80.09709% <ø> (ø)
server/options.go	97.26027% <ø> (ø)

... and 6 files with indirect coverage changes

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[WineChord]

LGTM