Specify that split_ascii_whitespace uses the same definition as is_ascii_whitespace

Author: SimonSapin

library/core/src/str/mod.rs

@@ -1172,6 +1172,7 @@ impl str {
 /// The iterator returned will return string slices that are sub-slices of
 /// the original string slice, separated by any amount of ASCII whitespace.
 ///
+/// This uses the same definition as [`char::is_ascii_whitespace`].
 /// To split by Unicode `Whitespace` instead, use [`split_whitespace`].
 ///
 /// [`split_whitespace`]: str::split_whitespace
@@ -1190,7 +1191,8 @@ impl str {
 /// assert_eq!(None, iter.next());
 /// ```
 ///
-/// All kinds of ASCII whitespace are considered:
+/// Various kinds of ASCII whitespace are considered
+/// (see [`char::is_ascii_whitespace`]):
 ///
 /// ```
 /// let mut iter = " Mary had\ta little \n\t lamb".split_ascii_whitespace();