Update state.md

[rsekulski]

I think functions open and close were swapped in section about IndexedStateT.

[codecov-io]

Codecov Report

Merging #2248 into master will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2248      +/-   ##
==========================================
+ Coverage   94.65%   94.97%   +0.32%     
==========================================
  Files         333      337       +4     
  Lines        5777     5832      +55     
  Branches      217      217              
==========================================
+ Hits         5468     5539      +71     
+ Misses        309      293      -16

Impacted Files	Coverage Δ
.../src/main/scala/cats/syntax/applicativeError.scala	100% <0%> (ø)	⬆️
...rc/main/scala/cats/laws/discipline/Arbitrary.scala	100% <0%> (ø)	⬆️
core/src/main/scala/cats/syntax/option.scala	100% <0%> (ø)	⬆️
laws/src/main/scala/cats/laws/MonadLaws.scala	100% <0%> (ø)	⬆️
core/src/main/scala/cats/syntax/nested.scala	100% <0%> (ø)
core/src/main/scala/cats/syntax/binested.scala	100% <0%> (ø)
core/src/main/scala/cats/data/Binested.scala	100% <0%> (ø)
core/src/main/scala/cats/data/Op.scala	87.5% <0%> (ø)
core/src/main/scala/cats/data/Ior.scala	98.48% <0%> (+0.01%)	⬆️
core/src/main/scala/cats/data/Kleisli.scala	96.93% <0%> (+0.03%)	⬆️
... and 5 more

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[johnynek]

Can we change the tut to actually catch this error? Like it we had run open against an Open door, it should have failed. Can we add positive and negative examples of that now and make sure tut catches the issue?

[ceedubs]

I agree with @johnynek that changing the tut doc to catch this would be better. But fixing the typo is still an improvement.

[rsekulski]

I'm really sorry for such late response. I've added code which tries to run valid with both Open and Closed to demonstrate type safety.

[ceedubs]

Thanks @rsekulski!