[doc-only] Update LICENSE.md (#1633)

* Update LICENSE.md

Call out cuda.pathfinder as Apache 2.0

* Fix trailing whitespace pre-commit error

---------

Co-authored-by: Ralf W. Grosse-Kunstleve <rgrossekunst@nvidia.com>

Author: jollylili

LICENSE.md

@@ -1,4 +1,6 @@
 This repository is structured in a way that files are licensed differently
    - [`cuda.python`](./cuda_python/LICENSE): NVIDIA Software License
    - [`cuda.bindings`](./cuda_bindings/LICENSE): NVIDIA Software License
-   - [`cuda.core`](./cuda_core/LICENSE) and everything else in this repository: Apache 2.0
+   - [`cuda.core`](./cuda_core/LICENSE): Apache 2.0
+   - [`cuda.pathfinder`](./cuda_pathfinder/LICENSE): Apache 2.0
+   - Repo metadata, CI tools, GitHub workflows: Apache 2.0