docs: clarify the setCanaryScale of Dynamic Canary Scale

[huikang]

Signed-off-by: Hui Kang [email protected]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[codecov]

Codecov Report

Merging #1703 (db6b234) into master (b3d50d1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1703   +/-   ##
=======================================
  Coverage   82.06%   82.06%           
=======================================
  Files         116      116           
  Lines       16075    16075           
=======================================
  Hits        13192    13192           
  Misses       2210     2210           
  Partials      673      673           

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