Fix deadlink

Signed-off-by: Anuradha Karuppiah <anuradhak@nvidia.com>

Author: AnuradhaKaruppiah

.github/PULL_REQUEST_TEMPLATE.md

@@ -5,7 +5,7 @@
 Closes
 
 ## By Submitting this PR I confirm:
-- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/NeMo-Agent-Toolkit/blob/develop/docs/source/resources/contributing.md).
+- I am familiar with the [Contributing Guidelines](https://github.com/NVIDIA/NeMo-Agent-Toolkit/blob/develop/docs/source/resources/contributing/index.md).
 - We require that all contributors "sign-off" on their commits. This certifies that the contribution is your original work, or you have rights to submit it under the same license, or a compatible license.
   - Any contribution which contains commits that are not Signed-Off will not be accepted.
 - When the PR is ready for review, new or existing tests cover these changes.