Clairy format required for specifiying roles (#4194)

## What are you changing in this pull request and why?
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The section is unclear to SEP users and SAs and had to be rewritten for
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website/docs/docs/core/connect-data-platform/trino-setup.md

@@ -83,7 +83,7 @@ The following profile fields are optional to set up. They let you configure your
 | Profile field                 | Example                          | Description                                                                                                 |
 | ----------------------------- | -------------------------------- | ----------------------------------------------------------------------------------------------------------- |
 | `threads`                     | `8`                              | How many threads dbt should use (default is `1`)                                                            |
-| `roles`                       | `system: analyst`                | Catalog roles                                                                                               |
+| `roles`                       | `system: analyst`                | Catalog roles can be set under the optional `roles` parameter using following format: `catalog: role`.     |
 | `session_properties`          | `query_max_run_time: 4h`         | Sets Trino session properties used in the connection. Execute `SHOW SESSION` to see available options       |
 | `prepared_statements_enabled` | `true` or `false`                | Enable usage of Trino prepared statements (used in `dbt seed` commands) (default: `true`)                   |
 | `retries`                     | `10`                             | Configure how many times all database operation is retried when connection issues arise  (default: `3`)     |

website/snippets/connect-starburst-trino/roles-starburst-enterprise.md

@@ -1,3 +1,6 @@
-[comment: For context, the section title used for this snippet is "Roles in Starburst Enterprise" ]: # 
+[comment: For context, the section title used for this snippet is "Roles in Starburst Enterprise" ]: #
 
-If connecting to a Starburst Enterprise cluster with built-in access controls enabled, you can't add the role as a suffix to the username, so the default role for the provided username is used instead.
+If connecting to a Starburst Enterprise cluster with built-in access controls
+enabled, you must specify a role using the format detailed in [Additional
+parameters](#additional-parameters). If a role is not specified, the default
+role for the provided username is used.