Docs: Fix missing global tag and remove non-standard hook tag

[huzaifaalmesbah]

Description

This PR addresses inline documentation issues in includes/bootstrap.php and includes/helpers.php to align with WordPress coding standards.

Changes

• includes/bootstrap.php: Added the missing @global tag for $wp_version in the check_wp_version() function docblock.
• includes/helpers.php: Removed the non-standard @hook tag from the get_preferred_models_for_text_generation function docblock.

[github-actions]

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Co-authored-by: huzaifaalmesbah <huzaifaalmesbah@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.80%. Comparing base (7726dc0) to head (b8c3e49).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #207   +/-   ##
==========================================
  Coverage      50.80%   50.80%           
  Complexity       375      375           
==========================================
  Files             27       27           
  Lines           1978     1978           
==========================================
  Hits            1005     1005           
  Misses           973      973           

Flag	Coverage Δ
unit	50.80% <ø> (ø)

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