servicesAndDiscovery -> Discovery

[chenrui333]

Relates to #1787 menu update.

I have encountered some understanding when I help with kubernetes/website documentation i18n process. I think this renaming is necessary and helpful.

[codecov]

Codecov Report

Merging #3433 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3433      +/-   ##
==========================================
- Coverage   54.66%   54.65%   -0.01%     
==========================================
  Files         565      565              
  Lines       12473    12473              
==========================================
- Hits         6818     6817       -1     
- Misses       5392     5393       +1     
  Partials      263      263

Impacted Files	Coverage Δ
...p/backend/integration/metric/common/aggregation.go	87.69% <0%> (-1.54%)	⬇️

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[chenrui333]

That is just a comment update, not sure why cov-report goes down.

Also we might need to update some other label-related information.

[ianlewis]

/lgtm

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