Fix broken links

Author: pauldowman

pages/builders/node-operators/network-upgrades.mdx

@@ -38,8 +38,8 @@ recent activation. These are a reflection of the [Superchain Upgrades Specificat
 
 The Granite upgrade limits `bn256Pairing` precompile input size and reduces the Channel Timeout.
 
-*   [Limit `bn256Pairing` precompile input size](./exec-engine.md#bn256pairing-precompile-input-restriction)
-*   [Reduce Channel Timeout to 50](./derivation.md#reduce-channel-timeout)
+*   [Limit `bn256Pairing` precompile input size](https://specs.optimism.io/protocol/granite/exec-engine.html#bn256pairing-precompile-input-restriction)
+*   [Reduce Channel Timeout to 50](https://specs.optimism.io/protocol/granite/derivation.html#reduce-channel-timeout)
 
 ### [Fjord](https://specs.optimism.io/protocol/fjord/overview.html)