Clarify TOML array table comment

[yawkat]

Summary

• clarify the TOML parser comment for array-of-tables traversal
• remove the stale claim that simple dotted-key assignments into arrays of tables are accepted
• leave parser behavior unchanged

Verification

• JAVA_HOME=/usr/lib/jvm/java-21-openjdk MAVEN_USER_HOME=/home/opc/dev/agent-work/toml329/.m2-jackson ./mvnw -pl toml -am test -q
• git diff --check

[github-actions]

🧪 Code Coverage Report

Metric	Coverage	Change
Instructions	70.85%	📈 +0.000%
Branches	65.52%	📈 +0.000%

Coverage data generated from JaCoCo test results

[Copilot]

Pull request overview

Updates an internal comment in TomlParser to more precisely describe how the parser traverses arrays-of-tables when parsing table headers, without changing runtime behavior. This aligns the documentation with the actual implementation (which rejects dotted-key assignments into arrays-of-tables).

Changes:

• Refines the array-of-tables traversal comment to explicitly scope the “broad” interpretation to table headers.
• Removes the stale claim that simple dotted keys can extend arrays-of-tables.

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[yawkat]

Merging without review since this is just a comment change