docs: correct title in faq

[woile]

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

[codecov]

Codecov Report

Merging #344 (1605d69) into master (bf3fce4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #344   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files          35       35           
  Lines         999      999           
=======================================
  Hits          972      972           
  Misses         27       27           

Flag	Coverage Δ
unittests	97.29% <ø> (ø)

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