ClickHouse: Fix MATERIALIZED column option docs typo (#2410)

Author: Hashim1999164

src/ast/ddl.rs

@@ -1913,8 +1913,8 @@ pub enum ColumnOption {
     /// `DEFAULT <restricted-expr>`
     Default(Expr),
 
-    /// `MATERIALIZE <expr>`
-    /// Syntax: `b INT MATERIALIZE (a + 1)`
+    /// `MATERIALIZED <expr>`
+    /// Syntax: `b INT MATERIALIZED (a + 1)`
     ///
     /// [ClickHouse](https://clickhouse.com/docs/en/sql-reference/statements/create/table#default_values)
     Materialized(Expr),