Improve #45546, by changing the capture to be variant instead of type.

Release Notes:

- Improved Rust enum variant highlighting as variant instead of type.

Before (note variants have the same style as `Foo`):
<img width="276" height="162" alt="image"
src="https://github.com/user-attachments/assets/fa0d8f48-a286-4a8d-b89d-269cb1657e55"
/>

After:
<img width="276" height="162" alt="image"
src="https://github.com/user-attachments/assets/c442494a-7550-481a-a8b9-f2d944a67868"
/>