doc(examples): Fix missing piece from previous commit

Signed-off-by: Chris Hennick <4961925+Pr0methean@users.noreply.github.com>

examples/write-large-file.rs

@@ -13,7 +13,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     }
 
     let filename = &*args[1];
-    #![] {
+    #![cfg(feature = "_deflate-any")] {
         doit(filename)?;
     }
     Ok(())