Add doc examples for `Url::has_authority`.

src/lib.rs

@@ -493,6 +493,21 @@ impl Url {
     ///
     /// URLs that do *not* are either path-only like `unix:/run/foo.socket`
     /// or cannot-be-a-base like `data:text/plain,Stuff`.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use url::Url;
+    ///
+    /// let url = Url::parse("ftp://rms@example.com").unwrap();
+    /// assert!(url.has_authority());
+    ///
+    /// let url = Url::parse("unix:/run/foo.socket").unwrap();
+    /// assert!(!url.has_authority());
+    ///
+    /// let url = Url::parse("data:text/plain,Stuff").unwrap();
+    /// assert!(!url.has_authority());
+    /// ```
     #[inline]
     pub fn has_authority(&self) -> bool {
         debug_assert!(self.byte_at(self.scheme_end) == b':');