Updating Voucherify (partner) documentation

[janiksam]

Pull Request/Issue Resolution

Description of Change:

Updating Voucherify (partner) documention; adding notes to referral section and truncating API call in Connected Content example because of a newly available endpoint for loyalty members.

Closes #ISSUE_NUMBER_HERE

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

• Yes (Insert Feature Release Date Here)
• No

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[vercel]

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[janiksam]

@KellieHawks requesting your review on partner documentation updates.