Update a mention of the source of truth for suppored types in the docs

docs/usage/data-modelling/types.md

@@ -33,7 +33,7 @@ You are responsible for ensuring the uniqueness of your primary keys. If you som
 - `bigint`
 - `double precision`
 
-The authoritative list of supported data types is maintained in the [`supported_pg_types/0` function](https://github.com/search?q=repo%3Aelectric-sql%2Felectric+symbol%3Asupported_pg_types&type=code).
+The authoritative list of supported data types is maintained in the [`validate_table_column_types.sql.eex` file](https://github.com/electric-sql/electric/blob/main/components/electric/lib/electric/postgres/extension/functions/validate_table_column_types.sql.eex).
 
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