rustdoc: Replace no-pretty-expanded with pretty-expanded

Now that features must be declared expanded source often does not compile.
This adds 'pretty-expanded' to a bunch of test cases that still work.

src/test/run-pass/object-lifetime-default-from-ref-struct.rs

@@ -11,6 +11,8 @@
 // Test that the lifetime of the enclosing `&` is used for the object
 // lifetime bound.
 
+// pretty-expanded FIXME #23616
+
 #![allow(dead_code)]
 
 trait Test {