Fix rustdoc stabilized versions layout

Author: Matteo Briani

src/librustdoc/html/render/print_item.rs

@@ -979,7 +979,9 @@ fn item_enum(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, e: &clean::Enum
                 }
                 w.write_str(")");
             }
-            w.write_str("</code></div>");
+            w.write_str("</code>");
+            render_stability_since(w, variant, it, cx.tcx());
+            w.write_str("</div>");
             document(w, cx, variant, Some(it));
             document_non_exhaustive(w, variant);
 
@@ -1021,7 +1023,6 @@ fn item_enum(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, e: &clean::Enum
                 w.write_str("</div></div>");
                 toggle_close(w);
             }
-            render_stability_since(w, variant, it, cx.tcx());
         }
     }
     let def_id = it.def_id.expect_real();

src/librustdoc/html/static/rustdoc.css

@@ -654,6 +654,12 @@ a {
 	background: transparent;
 }
 
+.small-section-header {
+	display: flex;
+	justify-content: space-between;
+	position: relative;
+}
+
 .small-section-header:hover > .anchor {
 	display: initial;
 }