fix(docs): update broken 'creating a new rule' link in contributor guide

[zainabfatima097]

Pull request checklist

Make sure you:

• [ ] Signed the Contributor License Agreement (after creating PR)
• [ ] Followed the commit message guidelines

For non-trivial changes, please make sure you also:

• [ ] Added/Updated related documentation.
• [ ] Added/Updated related tests.

Short description of the change(s)

[linux-foundation-easycla[bot]]

• :white_check_mark:login: zainabfatima097 / (aefab4213fb6a7ba3088b6c6b48afd661b901215)

The committers listed above are authorized under a signed CLA.