Remove manual linkage from docs (zenml-io#2272) (zenml-io#2273)

(cherry picked from commit 625c46c)

docs/book/user-guide/advanced-guide/data-management/model-management.md

@@ -323,17 +323,5 @@ artifact, and you specify whether it's for a model or deployment by using the
 `is_model_artifact` and `is_deployment_artifact` flags (as shown above) else it
 will be assumed to be a data artifact.
 
-### Manual Linkage
-
-Finally, artifacts can be linked to an existing model version manually using the
-SDK:
-
-```python
-model_version = ModelVersion(name="my_model", version="1.0.0")
-model_version.link_artifact(my_artifact, name="new_artifact")
-```
-
-The `link_artifact` method handles creating this connection.
-
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