add missing deny lint

Author: ChAoSUnItY

tests/rustdoc-ui/lints/no-redundancy.rs

@@ -1,4 +1,6 @@
 // check-pass
 
+#![deny(rustdoc::redundant_explicit_links)]
+
 /// [Vec][std::vec::Vec#examples] should not warn, because it's not actually redundant!
 pub fn func() {}