docs: update snowpack-plugin.rst on dynamic imports

[amankkg]

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[codecov]

Codecov Report

Merging #1026 (e5eeec3) into main (76553af) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1026   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files          53       53           
  Lines        1622     1622           
  Branches      436      436           
=======================================
  Hits         1352     1352           
  Misses        157      157           
  Partials      113      113           

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[semoal]

Super! Thanks mate