docs: Fix typo on example for wxt.config.ts.

[ryohidaka]

A single-byte space was missing from the sample comment in wxt.config.ts .

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.58%. Comparing base (c099942) to head (7f19e75).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #609      +/-   ##
==========================================
- Coverage   86.64%   86.58%   -0.07%     
==========================================
  Files         112      112              
  Lines        9032     9032              
  Branches      906      906              
==========================================
- Hits         7826     7820       -6     
- Misses       1192     1198       +6     
  Partials       14       14              

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