Added a doc test for std::path::strip_prefix

Author: CromFr

library/std/src/path.rs

@@ -2504,6 +2504,7 @@ impl Path {
     /// assert_eq!(path.strip_prefix("/test/haha/foo.txt/"), Ok(Path::new("")));
     ///
     /// assert!(path.strip_prefix("test").is_err());
+    /// assert!(path.strip_prefix("/te").is_err());
     /// assert!(path.strip_prefix("/haha").is_err());
     ///
     /// let prefix = PathBuf::from("/test/");