Remove extra paren in withState example

[AugustinLF]

No description provided.

[codecov-io]

Codecov Report

Merging #411 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #411   +/-   ##
======================================
  Coverage    88.8%   88.8%           
======================================
  Files          50      50           
  Lines         375     375           
======================================
  Hits          333     333           
  Misses         42      42

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a6fe138...0fcfd6a. Read the comment docs.

[istarkov]

Thank you!