[rustdoc] Add missing close tags in extern crate reexports

Author: Brian Campbell

src/librustdoc/html/render/print_item.rs

@@ -439,6 +439,7 @@ fn item_module(cx: &Context<'_>, item: &clean::Item, items: &[clean::Item]) -> i
                                 )?;
                             }
                         }
+                        write!(w, "</code></dt>")?
                     }
                     clean::ImportItem(ref import) => {
                         let stab_tags =

tests/rustdoc/extern/pub-extern-crate-150176.rs

@@ -0,0 +1,5 @@
+//@ aux-build:pub-extern-crate.rs
+
+//@ has pub_extern_crate_150176/index.html
+//@ hasraw - 'pub extern crate inner;</code></dt>'
+pub extern crate inner;