add missing description for chat_api_url

Author: nerpaula

site/content/ai-suite/reference/importer.md

@@ -121,6 +121,7 @@ Where:
 - `username`: ArangoDB database user with permissions to create and modify collections
 - `db_name`: Name of the ArangoDB database where the knowledge graph will be stored
 - `chat_api_provider`: API provider for language model services
+- `chat_api_url`: API endpoint URL for the chat/language model service
 - `embedding_api_provider`: API provider for embedding model services
 - `embedding_api_url`: API endpoint URL for the embedding model service
 - `chat_model`: Specific language model to use for text generation and analysis
@@ -164,6 +165,7 @@ Where:
 - `username`: ArangoDB database user with permissions to access collections
 - `db_name`: Name of the ArangoDB database where the knowledge graph is stored
 - `chat_api_provider`: API provider for language model services
+- `chat_api_url`: API endpoint URL for the chat/language model service
 - `embedding_api_provider`: API provider for embedding model services
 - `embedding_api_url`: API endpoint URL for the embedding model service
 - `chat_model`: Specific language model to use for text generation and analysis