Fix missing end of code block in doc
diff --git a/src/parse.rs b/src/parse.rs
index a6afe01..28de2b9 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -689,6 +689,7 @@
     /// }
     /// #
     /// # fn main() {}
+    /// ```
     pub fn is_empty(&self) -> bool {
         self.cursor().eof()
     }