docs: Update BlogLayout.vue useData to correctly type

[PatrykKuniczak]

To fix:

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.51%. Comparing base (9ee07f4) to head (c9df4df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2369      +/-   ##
==========================================
- Coverage   78.69%   78.51%   -0.19%     
==========================================
  Files         133      133              
  Lines        3882     3882              
  Branches      875      875              
==========================================
- Hits         3055     3048       -7     
- Misses        741      747       +6     
- Partials       86       87       +1     

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commit: c9df4df