docs: fix link syntax (MystenLabs#18186)

## Description 

Fix the link syntax to make it work.

## Test plan 

No.

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

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Co-authored-by: ronny-mysten <[email protected]>

docs/README.md

@@ -48,4 +48,4 @@ Sui is for the community. Contribute for the benefit of all.
 
 ## License
 
-The Sui Documentation is distributed under the [LICENSE](CC BY 4.0 license).
+The Sui Documentation is distributed under the [CC BY 4.0 license](../LICENSE-docs).