fix print mean for show MKD on ProductRepr

[dehann]

No description provided.

[codecov-commenter]

Codecov Report

Merging #164 (3ac4a74) into master (873e74b) will increase coverage by 0.18%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   51.44%   51.62%   +0.18%     
==========================================
  Files          16       16              
  Lines         760      767       +7     
==========================================
+ Hits          391      396       +5     
- Misses        369      371       +2     

Impacted Files	Coverage Δ
src/services/ManifoldKernelDensity.jl	63.23% <75.00%> (+0.44%)	⬆️

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