docs(examples): chain stops at first multi-key object

[metalshark]

Description

Section 13.4 Key Folding and Path Expansion
Encoder: Key Folding
Chain stops at first multi-key object
These examples however do not stop chaining at the first multi-key object.

Type of Change

• 📝 Clarification (typo fix, grammar improvement, clarifying language)
• 📚 Documentation (adding examples, improving structure)
• ✨ Minor change (backward-compatible addition or clarification)
• 🔥 Major change (breaking change, new syntax, conformance requirement change)
• 🧪 Test fixtures (adding or updating test cases)
• 🔧 Other (please describe):

Motivation and Context

This changes examples to comply with the specification.

Changes Made

Fixed chaining and indentation.

Specification Sections Affected

• Section 13.4 Key Folding and Path Expansion

Backward Compatibility

• ✅ Fully backward-compatible (no breaking changes)
• ⚠️ Potentially breaking (requires careful review)
• 💥 Breaking change (requires major version bump)

Impact on Existing Implementations

• Any implementations that used the examples as test fixtures will need updated.

Test Coverage

• Existing test fixtures pass
• New test fixtures added (if applicable)
• Examples in SPEC.md updated
• Reference implementation behavior documented

Documentation

• SPEC.md updated
• CHANGELOG.md updated
• Examples updated (if applicable)
• README.md updated (if applicable)
• Test fixtures updated (if applicable)

Checklist

• I have read CONTRIBUTING.md
• I have searched for similar PRs and issues
• My changes follow the specification writing style guidelines
• I have used RFC 2119 keywords (MUST, SHOULD, MAY) correctly where applicable
• I have provided clear examples
• I have updated CHANGELOG.md with my changes
• I have considered the impact on existing implementations
• For breaking changes: I have provided a migration strategy
• All new and existing tests pass