Update ruby.mdx (#1506)

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> [!IMPORTANT]
> Update URL in `ruby.mdx` from `ruby-example` to `ruby-starter`.
> 
>   - **Documentation**:
> - Update URL in `ruby.mdx` from `ruby-example` to `ruby-starter` to
reflect new repository path.
> 
> <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 d645eda. It will automatically
update as commits are pushed.</sup>

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fern/01-guide/02-languages/ruby.mdx

@@ -1,4 +1,4 @@
-<Note>You can check out this repo: https://github.com/BoundaryML/baml-examples/tree/main/ruby-example</Note>
+<Note>You can check out this repo: https://github.com/BoundaryML/baml-examples/tree/main/ruby-starter</Note>
 
 To set up BAML with Ruby do the following: