[DOCS] Fix typo in state names

[emstoudenmire]

This PR fixes a small typo in the docs reported by forum user Zhen_H in the following post:
https://itensor.discourse.group/t/small-typo-in-the-itensor-documentation/2274

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.44%. Comparing base (fb858d1) to head (5046219).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1625   +/-   ##
=======================================
  Coverage   79.44%   79.44%           
=======================================
  Files          64       64           
  Lines        5083     5083           
=======================================
  Hits         4038     4038           
  Misses       1045     1045           

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[mtfishman]

Thanks, can you bump the package version?

[emstoudenmire]

Ok package version bumped 👍

[mtfishman]

Ok package version bumped 👍

Thanks! I realize it may seem strange to bump the version for changes to the docs but it makes sure it shows up in the latest stable version of the docs.

[emstoudenmire]

No problem, and thanks for that info