Fix panic in docs for librustc_data_structures

src/librustc_data_structures/transitive_relation.rs

@@ -110,7 +110,7 @@ pub fn contains(&self, a: &T, b: &T) -> bool {
     /// (there are corresponding tests below, btw). In each case,
     /// the query is `postdom_upper_bound(a, b)`:
     ///
-    /// ```
+    /// ```text
     /// // returns Some(x), which is also LUB
     /// a -> a1 -> x
     ///            ^