Add missing keys and new example to modelSpec

[felixthekraut]

• Updated to real-world example
• Added model
• Additional example for promptPrefix
• Updated greeting
• Added link to interface page

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Name	Status	Preview	Comments	Updated (UTC)
librechat-ai	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 23, 2024 1:25pm

[felixthekraut]

All of the settings work as documented

[fuegovic]

Thanks!