doc(state-store): fix a typo

[stdrc]

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What's changed and what's your intention?

Fix a little little typo in the document.

Checklist

- [ ] I have written necessary docs and comments
- [ ] I have added necessary unit tests and integration tests

• All checks passed in ./risedev check (or alias, ./risedev c)

[codecov]

Codecov Report

Merging #3534 (2da98a1) into main (b8a4b47) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3534   +/-   ##
=======================================
  Coverage   74.49%   74.49%           
=======================================
  Files         771      771           
  Lines      108342   108342           
=======================================
  Hits        80709    80709           
  Misses      27633    27633           

Flag	Coverage Δ
rust	74.49% <ø> (ø)

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Impacted Files	Coverage Δ
src/common/src/types/ordered_float.rs	24.70% <0.00%> (-0.20%)	⬇️
src/meta/src/manager/id.rs	96.06% <0.00%> (ø)
src/frontend/src/expr/utils.rs	98.99% <0.00%> (+0.25%)	⬆️

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