feat: Add 'object-safety' ID to init_id_map() in rustdoc

Author: poliorcetics

src/librustdoc/html/markdown.rs

@@ -1545,6 +1545,7 @@ fn init_id_map() -> FxHashMap<Cow<'static, str>, usize> {
     map.insert("required-associated-consts".into(), 1);
     map.insert("required-methods".into(), 1);
     map.insert("provided-methods".into(), 1);
+    map.insert("object-safety".into(), 1);
     map.insert("implementors".into(), 1);
     map.insert("synthetic-implementors".into(), 1);
     map.insert("implementations-list".into(), 1);

src/librustdoc/html/render/print_item.rs

@@ -964,7 +964,8 @@ fn item_trait(w: &mut Buffer, cx: &mut Context<'_>, it: &clean::Item, t: &clean:
             w,
             "object-safety",
             "Object Safety",
-            &format!("<div class=\"object-safety-info\">This trait is <b>not</b> \
+            &format!(
+                "<div class=\"object-safety-info\">This trait is <b>not</b> \
                 <a href=\"{base}/reference/items/traits.html#object-safety\">\
                 object safe</a>.</div>",
                 base = crate::clean::utils::DOC_RUST_LANG_ORG_CHANNEL