Update the URL and API desc

[irfanpena]

Describe Your Changes

• Update the URL and API desc

Fixes Issues

• Closes #
• Closes #

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[louis-jan]

Sorry @irfanpena, since you are working on this, please help on this as well:

These chat/completion parameters do not work with the TensorRT-LLM engine:

• frequency_penalty
• presence_penalty
• top_p

Also when I try the Playground, Post chat/completions example gives a weird messages structure.

messages: [ string ] where it should be

"messages": [
    {
        "role: "user"
        "content: "hello"
    }
]

[louis-jan]

LGTM