Fix links in docs

[shu-mutou]

Closes: #4810

[codecov]

Codecov Report

Merging #4813 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4813      +/-   ##
==========================================
+ Coverage   45.42%   45.43%   +0.01%     
==========================================
  Files         214      214              
  Lines        9977     9977              
  Branches       94       94              
==========================================
+ Hits         4532     4533       +1     
+ Misses       5181     5180       -1     
  Partials      264      264

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	90.9% <0%> (+1.81%)	⬆️

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[maciaszczykm]

/lgtm

[k8s-ci-robot]

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