SUMMARY: add staging/{rust-device,dev} topic branches to the links

These links should have been there since they were added.

Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

SUMMARY.md

@@ -65,6 +65,8 @@
 
   - [`staging/rust-pci`](https://github.com/Rust-for-Linux/linux/tree/staging/rust-pci)
   - [`staging/rust-net`](https://github.com/Rust-for-Linux/linux/tree/staging/rust-net)
+  - [`staging/rust-device`](https://github.com/Rust-for-Linux/linux/tree/staging/rust-device)
+  - [`staging/dev`](https://github.com/Rust-for-Linux/linux/tree/staging/dev)
 
 ## Documentation