[doc] Fix typo in faq.rst

[isdanni]

Related issue = #

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file changed

• docs/faq.rst

no related issue

[codecov]

Codecov Report

Merging #1636 into master will decrease coverage by 0.15%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1636      +/-   ##
==========================================
- Coverage   63.32%   63.17%   -0.16%     
==========================================
  Files          19       19              
  Lines        3730     3731       +1     
  Branches      660      661       +1     
==========================================
- Hits         2362     2357       -5     
- Misses       1247     1254       +7     
+ Partials      121      120       -1     

Impacted Files	Coverage Δ
python/taichi/lang/__init__.py	54.75% <0.00%> (-0.15%)	⬇️
python/taichi/lang/meta.py	60.29% <0.00%> (-4.42%)	⬇️
python/taichi/lang/transformer.py	80.55% <0.00%> (-0.38%)	⬇️
python/taichi/lang/linalg.py	90.00% <0.00%> (ø)

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[archibate]

Nice catch!