Docstring correction

Author: timsaucer

datafusion/physical-expr-common/src/sort_expr.rs

@@ -57,7 +57,7 @@ use itertools::Itertools;
 /// #  fn data_type(&self, input_schema: &Schema) -> Result<DataType> {todo!()}
 /// #  fn nullable(&self, input_schema: &Schema) -> Result<bool> {todo!() }
 /// #  fn evaluate(&self, batch: &RecordBatch) -> Result<ColumnarValue> {todo!() }
-/// #  fn output_field(&self, input_schema: &Schema) -> Result<Field> { unimplemented!() }
+/// #  fn return_field(&self, input_schema: &Schema) -> Result<Field> { unimplemented!() }
 /// #  fn children(&self) -> Vec<&Arc<dyn PhysicalExpr>> {todo!()}
 /// #  fn with_new_children(self: Arc<Self>, children: Vec<Arc<dyn PhysicalExpr>>) -> Result<Arc<dyn PhysicalExpr>> {todo!()}
 /// # fn fmt_sql(&self, f: &mut Formatter<'_>) -> std::fmt::Result { todo!() }