fix: google-vertex docs (#1571)

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> [!IMPORTANT]
> Fixes link for `vertex-ai` provider in `client-constructor.mdx`.
> 
>   - **Documentation**:
> - Fixes link for `vertex-ai` provider in `client-constructor.mdx` from
`/docs/snippets/clients/providers/vertex` to
`/docs/snippets/clients/providers/google-vertex`.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for f11c9b7. It will automatically
update as commits are pushed.</sup>

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Author: Ben-Epstein

fern/snippets/client-constructor.mdx

@@ -11,7 +11,7 @@ The configuration modifies the URL request BAML runtime makes.
 | `google-ai`      | [Google AI](/docs/snippets/clients/providers/gemini)                |                                                            |
 | `openai`         | [OpenAI](/docs/snippets/clients/providers/openai)                   |                                                            |
 | `openai-generic` | [OpenAI (generic)](/docs/snippets/clients/providers/openai-generic) | Any model provider that supports an OpenAI-compatible API  |
-| `vertex-ai`      | [Vertex AI](/docs/snippets/clients/providers/vertex)                |                                                            |
+| `vertex-ai`      | [Vertex AI](/docs/snippets/clients/providers/google-vertex)         |                                                            |
 
 We also have some special providers that allow composing clients together:
 | Provider Name  | Docs                             | Notes                                                      |