docs: link reference docs at c.g.c/cpp/docs/reference

[coryan]

This change is 

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (293fc62) 93.76% compared to head (6fedf3a) 93.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11799      +/-   ##
==========================================
- Coverage   93.76%   93.76%   -0.01%     
==========================================
  Files        1834     1834              
  Lines      165923   165923              
==========================================
- Hits       155575   155574       -1     
- Misses      10348    10349       +1     

Impacted Files	Coverage Δ
generator/internal/scaffold_generator.cc	62.97% <ø> (ø)
generator/internal/scaffold_generator_test.cc	100.00% <ø> (ø)

... and 6 files with indirect coverage changes

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