docs: fix docstring formatting (#20158)

We were missing some closing backticks

Author: Jefffrey

datafusion/common/src/utils/mod.rs

@@ -516,6 +516,7 @@ impl SingleRowListArrayBuilder {
 /// );
 ///
 /// assert_eq!(list_arr, expected);
+/// ```
 pub fn arrays_into_list_array(
     arr: impl IntoIterator<Item = ArrayRef>,
 ) -> Result<ListArray> {
@@ -587,6 +588,7 @@ pub enum ListCoercion {
 /// let base_type = DataType::Float64;
 /// let coerced_type = coerced_type_with_base_type_only(&data_type, &base_type, None);
 /// assert_eq!(coerced_type, DataType::List(Arc::new(Field::new_list_field(DataType::Float64, true))));
+/// ```
 pub fn coerced_type_with_base_type_only(
     data_type: &DataType,
     base_type: &DataType,

datafusion/expr/src/expr.rs

@@ -310,6 +310,7 @@ impl From<sqlparser::ast::NullTreatment> for NullTreatment {
 /// assert!(rewritten.transformed);
 /// // to 42 = 5 AND b = 6
 /// assert_eq!(rewritten.data, lit(42).eq(lit(5)).and(col("b").eq(lit(6))));
+/// ```
 #[derive(Clone, PartialEq, PartialOrd, Eq, Debug, Hash)]
 pub enum Expr {
     /// An expression with a specific name.