Docs: update example Source YAML (#4842)

docs/docs/reference/connectors/motherduck.md

@@ -28,11 +28,10 @@ If creating a new DuckDB source from the UI, you should pass in the appropriate
 On the other hand, if you are creating the source YAML file directly, the definition should look something like:
 
 ```yaml
-
-type: "duckdb"
+type: "source"
+connector: "duckdb"
 sql: "SELECT * from <duckdb_table>"
 db: "<path_to_duckdb_db_file>"
-
 ```
 
 :::tip If deploying to Rill Cloud

docs/docs/reference/connectors/mysql.md

@@ -38,7 +38,8 @@ Alternatively, you can include the connection string directly in the source YAML
 An example of a source using this approach:
 
 ```yaml
-type: "mysql"
+type: "source"
+connector: "mysql"
 sql: "select * from my_table"
 dsn: "mysql_user:mysql_password@tcp(localhost:3306)/mysql_db"
 ```

docs/docs/reference/connectors/postgres.md

@@ -36,7 +36,8 @@ Alternatively, you can include the connection string directly in the source YAML
 An example of a source using this approach:
 
 ```yaml
-type: "postgres"
+type: "source"
+connector: "postgres"
 sql: "select * from my_table"
 database_url: "postgresql://postgres:postgres@localhost:5432/postgres"
 ```

docs/docs/reference/connectors/salesforce.md

@@ -22,7 +22,8 @@ rill start --var connector.salesforce.username="[email protected]" --var connecto
 
 Alternatively, you can also include the credentials directly in the underlying source YAML by adding the `username` and `password` parameters. For example, your source YAML may contain the following properties (also can be configured through the UI during source creation):
 ```yaml
-type: "salesforce"
+type: "source"
+connector: "salesforce"
 endpoint: "login.salesforce.com"
 username: "[email protected]"
 password: "MyPasswordMyToken"

docs/docs/reference/connectors/sqlite.md

@@ -22,10 +22,9 @@ In many cases, since SQLite is used as an in-process database, credentials are n
 On the other hand, if you are creating the source YAML file directly, the definition should look something like:
 
 ```yaml
-
-type: "duckdb"
+type: "source"
+connector: "duckdb"
 sql: "SELECT * FROM sqlite_scan('<path_to_sqlite_db>', '<table_name>');"
-
 ```
 
 :::tip