update prompt_cot.md so it has db_type (instead of generic "SQL")

prompts/prompt_cot.md

@@ -1,9 +1,9 @@
 <|start_header_id|>user<|end_header_id|>
 
-Generate a SQL query to answer this question: `{user_question}`
+Generate a {db_type} query to answer this question: `{user_question}`
 {instructions}
 DDL statements:
 {table_metadata_string}
 
-{cot_instructions}Generate a valid SQL query that answers the question `{user_question}`, and only references the tables and columns in the DDL statements.<|eot_id|><|start_header_id|>assistant<|end_header_id|>
+{cot_instructions}Generate a valid {db_type} query that answers the question `{user_question}`, and only references the tables and columns in the DDL statements.<|eot_id|><|start_header_id|>assistant<|end_header_id|>