docs: wording in template

[JakobMiksch]

SUMMARY

• Change the wording of a comment in the template for charting plugins.
• I found the previous wording not understandable, therefore I suggest this change

[codecov]

Codecov Report

Merging #21491 (3c6edf3) into master (2d16100) will not change coverage.
The diff coverage is n/a.

❗ Current head 3c6edf3 differs from pull request most recent head 92c9541. Consider uploading reports for the commit 92c9541 to get more accurate results

@@           Coverage Diff           @@
##           master   #21491   +/-   ##
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  Coverage   66.65%   66.65%           
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  Files        1792     1792           
  Lines       68480    68480           
  Branches     7270     7270           
=======================================
  Hits        45646    45646           
  Misses      20972    20972           
  Partials     1862     1862           

Flag	Coverage Δ
javascript	52.84% <ø> (ø)

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