ADd link to control structures

Author: timothymcmackin

docs/smart-contracts/logic/errors.md

@@ -64,7 +64,7 @@ In particular, the error value is often used when testing  contracts, where the
 
 - Michelson:
   - [Failures](https://octez.tezos.com/docs/active/michelson.html#failures)
-  - [Assertion macros](https://tezos.gitlab.io/active/michelson.html#assertion-macros)
+  - [Control structures](https://tezos.gitlab.io/michelson-reference/#instructions-control_structure)
   - [`FAILWITH`](https://tezos.gitlab.io/michelson-reference/#instr-FAILWITH)
 - Archetype: [require](https://archetype-lang.org/docs/reference/declarations/entrypoint/#require), [fail if](https://archetype-lang.org/docs/reference/declarations/entrypoint/#fail-if)
 - SmartPy: [Exceptions](https://smartpy.io/manual/syntax/exceptions)