docs(ast): align examples with current APIs

[jong-kyung]

Update the remaining AST documentation examples to match the current Oxc APIs.

• Use the current parser and AST node structures.
• Replace legacy AstBuilder methods with generated Expression::new_* methods.
• Update mutable visitor examples to use the current VisitMut and walk_mut signatures.
• Align node attributes, enum layout, semantic metadata, and GetSpan examples with their implementations.

The examples were verified against:

• crates/oxc_parser/examples/visitor.rs
• crates/oxc_ast_visit/src/generated/visit_mut.rs
• crates/oxc_ast/src/generated/ast_builder.rs
• crates/oxc_ast/src/ast/js.rs

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T06:10:01.207510Z	03e0dd6	PR opened

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