Update editorial-style-guide.md

[wearedood]

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[cb-heimdall]

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[cb-heimdall]

Review Error for Tq101510 @ 2025-09-12 08:07:31 UTC
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[wearedood]

Excellent editorial style guide updates! This PR adds valuable clarifications and improvements:

✅ Oxford comma guidelines - Clear guidance on when to use Oxford commas
✅ Em dash formatting - Proper spacing rules with examples
✅ Facilitator responsibilities - Important addition for group process mechanics
✅ Ampersand usage - Helpful guidelines for business names and abbreviations
✅ Parenthetical periods - Clear rules for period placement

All changes are well-documented with examples and external references. The additions enhance consistency and clarity for content creators. Ready to merge! 🚀