fix: using // sass comments in scss

[ClarkXia]

sass support syntaxes of comments in two ways:

• comments defined using /* */ that are (usually) compiled to CSS
• comments defined using // that are not

it will be nice to use // syntaxes while it do not compiled to CSS, it may cause some strange behavior while compile css in postcss

[codecov]

Codecov Report

Merging #3591 (3f4fd3c) into master (e20df59) will not change coverage.
The diff coverage is n/a.

❗ Current head 3f4fd3c differs from pull request most recent head d43ea23. Consider uploading reports for the commit d43ea23 to get more accurate results

@@           Coverage Diff           @@
##           master    #3591   +/-   ##
=======================================
  Coverage   90.63%   90.63%           
=======================================
  Files         302      302           
  Lines       17782    17782           
  Branches     5378     5378           
=======================================
  Hits        16116    16116           
  Misses       1647     1647           
  Partials       19       19           

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