Create desc-procedure.md (#1646)

Author: soyeric128

docs/en/sql-reference/10-sql-commands/00-ddl/18-procedure/desc-procedure.md

@@ -0,0 +1,51 @@
+---
+title: DESC PROCEDURE
+---
+import FunctionDescription from '@site/src/components/FunctionDescription';
+
+<FunctionDescription description="Introduced or updated: v1.2.690"/>
+
+Displays detailed information about a specific stored procedure.
+
+## Syntax
+
+```sql
+DESC | DESCRIBE PROCEDURE <procedure_name>([<parameter_type1>, <parameter_type2>, ...])
+```
+
+- If a procedure has no parameters, use empty parentheses: `DESC PROCEDURE <procedure_name>()`;
+- For procedures with parameters, specify the exact types to avoid errors.
+
+## Examples
+
+This example creates and then displays a stored procedure named `sum_even_numbers`.
+
+```sql
+CREATE PROCEDURE sum_even_numbers(start_val UInt8, end_val UInt8) 
+RETURNS UInt8 NOT NULL 
+LANGUAGE SQL 
+COMMENT='Calculate the sum of all even numbers' 
+AS $$
+BEGIN
+    LET sum := 0;
+    FOR i IN start_val TO end_val DO
+        IF i % 2 = 0 THEN
+            sum := sum + i;
+        END IF;
+    END FOR;
+    
+    RETURN sum;
+END;
+$$;
+
+DESC PROCEDURE sum_even_numbers(Uint8, Uint8);
+
+┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
+│  Property │                                                                                        Value                                                                                       │
+├───────────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
+│ signature │ (start_val,end_val)                                                                                                                                                                │
+│ returns   │ (UInt8)                                                                                                                                                                            │
+│ language  │ SQL                                                                                                                                                                                │
+│ body      │ BEGIN\n    LET sum := 0;\n    FOR i IN start_val TO end_val DO\n        IF i % 2 = 0 THEN\n            sum := sum + i;\n        END IF;\n    END FOR;\n    \n    RETURN sum;\nEND; │
+└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
+```