BD-3528 Docs feedback - Clarify message_extras Liquid

[rachel-feinberg]

Why are you making this change? (required)

Clarify a consideration for using Liquid with message_extra

Related PRs, issues, or features (optional)

BD-3528

Feature release date (optional)

• N/A

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[nmandel]

LGTM!

[lydia-xie]

lgtm