Update datafusion/src/physical_optimizer/pruning.rs

Author: alamb

datafusion/src/physical_optimizer/pruning.rs

@@ -60,7 +60,7 @@ use crate::{
 /// ```text
 /// min_values("a") -> Some([5, Null, 20])
 /// max_values("a") -> Some([20, Null, 30])
-/// min_values("X") -> None
+/// min_values("some_other_column") -> None
 /// ```
 pub trait PruningStatistics {
     /// return the minimum values for the named column, if known.