Fix symbol signature for right and left apply in faq.md

[suhasgaddam]

I think the right and left apply signatures should be switched, if I am reading https://github.com/typelevel/cats/blob/master/core/src/main/scala/cats/syntax/cartesian.scala#L20
and https://github.com/typelevel/cats/blob/master/core/src/main/scala/cats/syntax/cartesian.scala#L23
correctly.

[codecov-io]

Codecov Report

Merging #1899 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1899   +/-   ##
======================================
  Coverage    95.2%   95.2%           
======================================
  Files         248     248           
  Lines        4379    4379           
  Branches      125     125           
======================================
  Hits         4169    4169           
  Misses        210     210

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[kailuowang]

Thanks!

[kailuowang]

merge with 1 sign off as simple typo fix