[dagster-dbt] Add profiles_dir, profile and target to dbt reference (#29145)

## Summary & Motivation

As title.

## How I Tested These Changes

Docs preview

Author: maximearmstrong

docs/docs/integrations/libraries/dbt/reference.md

@@ -105,6 +105,18 @@ dagster dev
 
 In production, a precompiled manifest should be used. Using <PyObject section="libraries" object="DbtProject" module="dagster_dbt" />, the manifest can be created at build time by running the [`dagster-dbt project prepare-and-package`](/api/python-api/libraries/dagster-dbt#prepare-and-package) command in your CI/CD workflow. For more information, see the [Deploying a Dagster project with a dbt project](#deploying-a-dagster-project-with-a-dbt-project) section.
 
+## Selecting a profiles directory, profile and target for your dbt project
+
+You can specify which connection information dbt should use when parsing and executing your models. This can be done by passing the profiles directory, profile and target to your when creating your <PyObject section="libraries" object="DbtProject" module="dagster_dbt" /> object. These fields are optional - the default values defined in your dbt project will be used for each parameter that is not passed.
+
+<CodeExample
+  path="docs_snippets/docs_snippets/integrations/dbt/dbt.py"
+  startAfter="start_connection_information_with_dbt_project"
+  endBefore="end_connection_information_with_dbt_project"
+/>
+
+For more information, see dbt's guide about [connection profiles](https://docs.getdbt.com/docs/core/connect-data-platform/connection-profiles).
+
 ## Deploying a Dagster project with a dbt project
 
 :::note

examples/docs_snippets/docs_snippets/integrations/dbt/dbt.py

@@ -19,6 +19,23 @@ def scope_compile_dbt_manifest_with_dbt_project(manifest):
     # end_compile_dbt_manifest_with_dbt_project
 
 
+def scope_connection_information_with_dbt_project():
+    # start_connection_information_with_dbt_project
+    from pathlib import Path
+
+    from dagster_dbt import DbtProject
+
+    my_dbt_project = DbtProject(
+        project_dir=Path(__file__).joinpath("..", "..", "..").resolve(),
+        profiles_dir=Path(__file__)
+        .joinpath("..", "..", "..", "my_profiles_dir")
+        .resolve(),
+        profile="my_profile",
+        target="my_target",
+    )
+    # end_connection_information_with_dbt_project
+
+
 def scope_schedule_assets_dbt_only(manifest):
     from dagster import Config