Update docs/contributing/index.md

Co-authored-by: Ben Cumming <[email protected]>

Author: msimberg

docs/contributing/index.md

@@ -496,7 +496,7 @@ If possible, prefer linking to a primary section describing a topic instead of f
 However, if you believe it's beneficial to actually repeat the content, consider using [snippets](https://facelessuser.github.io/pymdown-extensions/extensions/snippets/) to avoid repeated information getting out of sync on different pages.
 Snippets allow including the contents of a text file in multiple places of the documentation.
 
-For example, the recommended NCCL environment variables are defined in a text file (`docs/software/commuinication/nccl_env_vars`) and included on multiple pages because it's essential that users of NCCL notice and use the environment variables.
+For example, the recommended NCCL environment variables are defined in a text file [`docs/software/commuinication/nccl_env_vars`](https://github.com/eth-cscs/cscs-docs/blob/main/docs/software/communication/nccl_env_vars) and included on multiple pages because it's essential that users of NCCL notice and use the environment variables.
 
 Snippets are included with `--8<-- path/to/snippet`.
 For example, to include the recommended NCCL environment variables, do the following: