Update CONTRIBUTING.rst

Author: coot

CONTRIBUTING.rst

@@ -6,13 +6,13 @@ The ``cardano-db-sync`` development is primarily based on the Nix infrastructure
 
 On how to set up Nix for ``cardano-db-sync`` development, please see `Building Cardano Node with nix <https://github.com/input-output-hk/cardano-node/tree/master/doc/getting-started/building-the-node-using-nix.md>`_.
 
-Our formater of choice is [`fourmolu`](https://github.com/fourmolu/fourmolu) on version 0.10.1.0 We have a script `scripts/fourmolize.sh` that can be run once fourmolu is intalled locally.
+Our formater of choice is `fourmolu <https://github.com/fourmolu/fourmolu>`_ on version 0.10.1.0 We have a script `scripts/fourmolize.sh` that can be run once fourmolu is intalled locally.
 
 Roles and Responsibilities
 ==========================
 
-We maintain a [CODEOWNERS file][CODEOWNERS] which provides information who
+We maintain a `CODEOWNERS file <CODEOWNERS>`_ which provides information who
 should review a contributing PR.  Note that you might need to get approvals
 from all code owners (even though GitHub doesn't give a way to enforce it).
 
-[CODEOWNERS]: https://github.com/input-output-hk/cardano-db-sync/blob/master//CODEOWNERS
+.. _CODEOWNERS https://github.com/input-output-hk/cardano-db-sync/blob/master/CODEOWNERS