Update custom-generic-tests.md (#5055)

I introduced a place holder text for you to replace with the actual URL
link to the proper Github website since the present link doesn't work.
Regards.
IL.

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website/docs/best-practices/custom-generic-tests.md

@@ -6,7 +6,7 @@ displayText: Writing custom generic data tests
 hoverSnippet: Learn how to write your own custom generic data tests.
 ---
 
-dbt ships with [Not Null](/reference/resource-properties/data-tests#not-null), [Unique](/reference/resource-properties/data-tests#unique), [Relationships](/reference/resource-properties/data-tests#relationships), and [Accepted Values](/reference/resource-properties/data-tests#accepted-values) generic data tests. (These used to be called "schema tests," and you'll still see that name in some places.) Under the hood, these generic data tests are defined as `test` blocks (like macros) in a globally accessible dbt project. You can find the source code for these tests in the [global project](https://github.com/dbt-labs/dbt-core/tree/main/core/dbt/include/global_project/macros/generic_test_sql).
+dbt ships with [Not Null](/reference/resource-properties/data-tests#not-null), [Unique](/reference/resource-properties/data-tests#unique), [Relationships](/reference/resource-properties/data-tests#relationships), and [Accepted Values](/reference/resource-properties/data-tests#accepted-values) generic data tests. (These used to be called "schema tests," and you'll still see that name in some places.) Under the hood, these generic data tests are defined as `test` blocks (like macros).
 
 :::info
 There are tons of generic data tests defined in open source packages, such as [dbt-utils](https://hub.getdbt.com/dbt-labs/dbt_utils/latest/) and [dbt-expectations](https://hub.getdbt.com/calogica/dbt_expectations/latest/) — the test you're looking for might already be here!