Update library/core/src/slice/mod.rs

Co-authored-by: Ibraheem Ahmed <ibraheem@ibraheem.ca>

Author: mgsloan

library/core/src/slice/mod.rs

@@ -3102,7 +3102,7 @@ impl<T> [T] {
     /// ```
     /// let mut v = [-5i32, 4, 2, -3, 1];
     ///
-    /// // Find the items `<=` the median, the median, and `>=` the median.
+    /// // Find the items `<=` to the median, the median itself, and the items `>=` to it.
     /// let (lesser, median, greater) = v.select_nth_unstable(2);
     ///
     /// assert!(lesser == [-3, -5] || lesser == [-5, -3]);