C++: Fix builtin name

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: jketema

cpp/ql/lib/change-notes/2026-10-16-builtins.md

@@ -1,4 +1,4 @@
 ---
 category: feature
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-* Added support for the `__builtin_lt_synthesizes_from_spaceship`, `__builtin_gt_synthesizes_from_spaceship`, `__builtin_le_synthesizes_from_spaceship`, `__builtin_ge_synthesizes_from_spaceship`, `__builtin_is_implicit_lifetime`, `bok_builtin_is_structural`, and `__builtin_is_virtual_base_of` builtin operations.
+* Added support for the `__builtin_lt_synthesizes_from_spaceship`, `__builtin_gt_synthesizes_from_spaceship`, `__builtin_le_synthesizes_from_spaceship`, `__builtin_ge_synthesizes_from_spaceship`, `__builtin_is_implicit_lifetime`, `__builtin_is_structural`, and `__builtin_is_virtual_base_of` builtin operations.