Omit lenses for not runnable doctests

crates/syntax/src/algo.rs

@@ -32,7 +32,7 @@ pub fn ancestors_at_offset(
 /// imprecise: if the cursor is strictly between two nodes of the desired type,
 /// as in
 ///
-/// ```no-run
+/// ```no_run
 /// struct Foo {}|struct Bar;
 /// ```
 ///