docs: change dep.js to polyfill.js in faqs

[zjffun]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

No issue

Description

Just change dep.js to polyfill.js in faqs.

[lukastaegert]

👍 Good catch!

[codecov]

Codecov Report

Merging #4521 (5b8d2d8) into master (14dedb5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4521   +/-   ##
=======================================
  Coverage   98.76%   98.76%           
=======================================
  Files         209      209           
  Lines        7395     7395           
  Branches     2108     2108           
=======================================
  Hits         7304     7304           
  Misses         32       32           
  Partials       59       59           

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