Issue #34076: Removing reference to removed path.prefix() function

Author: pwlandoll

src/libstd/path.rs

@@ -1443,8 +1443,7 @@ impl Path {
     /// `is_absolute` and `has_root` are equivalent.
     ///
     /// * On Windows, a path is absolute if it has a prefix and starts with the
-    /// root: `c:\windows` is absolute, while `c:temp` and `\temp` are not. In
-    /// other words, `path.is_absolute() == path.prefix().is_some() && path.has_root()`.
+    /// root: `c:\windows` is absolute, while `c:temp` and `\temp` are not.
     ///
     /// # Examples
     ///