Segment Extension docs to mention message options - MERGE 9/19

[KellieHawks]

Pull Request/Issue Resolution

Description of Change:

I'm changing..... (could be a link, a new image, a new section, etc.)... because...

Closes #ISSUE_NUMBER_HERE

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

---

✔️ Pull Request Checklist

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• Ensure you have completed our Contributors License Agreement.
• Tag @timothy-kim and @KellieHawks as a reviewer when your work is done and ready to be reviewed for merge. Are you an internal product manager? Reference the internal reviewing chart to tag the appropriate reviewer.
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• If you have modified any links, be sure to add redirects to assets > js > broken_redirect_list.js

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Work at Braze and not sure who to tag for review?
Before tagging @timothy-kim or @KellieHawks for a general review, reference the following chart to see if a specific product vertical/reviewer applies to your pull request.

Reviewer	Product Vertical
@timothy-kim	Data Infrastructure Platform Infrastructure Quality Infrastructure
@KellieHawks	Internal Tools Product Partnerships SDKs SMS
@bre-fitzgerald	Channels FIX Intelligence Reporting SMB
@lydia-xie	Email (Composition and Infrastructure) Ingestion Messaging

[vercel]

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Name	Status	Preview	Updated
braze-docs-en	✅ Ready (Inspect)	Visit Preview	Sep 14, 2022 at 6:55PM (UTC)

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braze-docs-fr	⬜️ Ignored (Inspect)		Sep 14, 2022 at 6:55PM (UTC)

[lydia-xie]

lgtm!