Rollup merge of rust-lang#86819 - GuillaumeGomez:cleanup-rustdoc-ids, r=jyn514

Clean up rustdoc IDs

I cherry-picked the commit from rust-lang#86178. It adds missing rustdoc IDs (for the HTML) and remove unused ones.

cc `@camelid`

r? `@jyn514`

Author: JohnTitor

src/librustdoc/html/markdown.rs

@@ -1358,7 +1358,10 @@ pub struct IdMap {
 
 fn init_id_map() -> FxHashMap<String, usize> {
     let mut map = FxHashMap::default();
-    // This is the list of IDs used by rustdoc templates.
+    // This is the list of IDs used in Javascript.
+    map.insert("help".to_owned(), 1);
+    // This is the list of IDs used in HTML generated in Rust (including the ones
+    // used in tera template files).
     map.insert("mainThemeStyle".to_owned(), 1);
     map.insert("themeStyle".to_owned(), 1);
     map.insert("theme-picker".to_owned(), 1);
@@ -1375,14 +1378,14 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("rustdoc-vars".to_owned(), 1);
     map.insert("sidebar-vars".to_owned(), 1);
     map.insert("copy-path".to_owned(), 1);
-    map.insert("help".to_owned(), 1);
     map.insert("TOC".to_owned(), 1);
-    map.insert("render-detail".to_owned(), 1);
-    // This is the list of IDs used by rustdoc sections.
+    // This is the list of IDs used by rustdoc sections (but still generated by
+    // rustdoc).
     map.insert("fields".to_owned(), 1);
     map.insert("variants".to_owned(), 1);
     map.insert("implementors-list".to_owned(), 1);
     map.insert("synthetic-implementors-list".to_owned(), 1);
+    map.insert("foreign-impls".to_owned(), 1);
     map.insert("implementations".to_owned(), 1);
     map.insert("trait-implementations".to_owned(), 1);
     map.insert("synthetic-implementations".to_owned(), 1);
@@ -1393,6 +1396,10 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("provided-methods".to_owned(), 1);
     map.insert("implementors".to_owned(), 1);
     map.insert("synthetic-implementors".to_owned(), 1);
+    map.insert("trait-implementations-list".to_owned(), 1);
+    map.insert("synthetic-implementations-list".to_owned(), 1);
+    map.insert("blanket-implementations-list".to_owned(), 1);
+    map.insert("deref-methods".to_owned(), 1);
     map
 }