Auto merge of #34108 - jseyfried:refactor_prelude_injection, r=nrc

Refactor away the prelude injection fold

Instead, just inject `#[prelude_import] use [core|std]::prelude::v1::*;` at the crate root while injecting `extern crate [core|std];` and process `#[no_implicit_prelude]` attributes in `resolve`.

r? @nrc

src/librustdoc/html/render.rs

@@ -1820,7 +1820,10 @@ fn item_module(w: &mut fmt::Formatter, cx: &Context,
         }
     }
 
-    write!(w, "</table>")
+    if curty.is_some() {
+        write!(w, "</table>")?;
+    }
+    Ok(())
 }
 
 fn short_stability(item: &clean::Item, cx: &Context, show_reason: bool) -> Vec<String> {