update mqtt-proxy doc

[suchen-sci]

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[codecov-commenter]

Codecov Report

Merging #593 (b43d2ea) into main (4212e79) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #593      +/-   ##
==========================================
- Coverage   80.18%   80.10%   -0.09%     
==========================================
  Files          95       95              
  Lines       10956    10956              
==========================================
- Hits         8785     8776       -9     
- Misses       1697     1701       +4     
- Partials      474      479       +5     

Impacted Files	Coverage Δ
pkg/object/mqttproxy/spec.go	100.00% <ø> (ø)
pkg/filter/headerlookup/headerlookup.go	86.71% <0.00%> (-2.10%)	⬇️
pkg/cluster/cluster.go	59.62% <0.00%> (-1.88%)	⬇️
pkg/object/mqttproxy/client.go	80.54% <0.00%> (+0.90%)	⬆️
pkg/filter/validator/basicauth.go	80.73% <0.00%> (+1.83%)	⬆️

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