Rollup merge of rust-lang#85972 - GuillaumeGomez:rustdoc-html-fixes, r=jsha

Rustdoc html fixes

rust-lang#84480 latest update allowed me to fix the remaining issues. The last one is coming from `pulldown-cmark` so I'll send them a fix soon.

r? `@jsha`

Author: GuillaumeGomez

src/librustdoc/html/layout.rs

@@ -105,7 +105,7 @@ crate fn render<T: Print, S: Print>(
                            placeholder=\"Click or press ‘S’ to search, ‘?’ for more options…\" \
                            type=\"search\">\
                 </div>\
-                <button type=\"button\" id=\"help-button\" title=\"help\">?</button>
+                <button type=\"button\" id=\"help-button\" title=\"help\">?</button>\
                 <a id=\"settings-menu\" href=\"{root_path}settings.html\" title=\"settings\">\
                     <img src=\"{static_root_path}wheel{suffix}.svg\" \
                          width=\"18\" height=\"18\" \
@@ -161,7 +161,7 @@ crate fn render<T: Print, S: Print>(
             }
         },
         title = page.title,
-        description = page.description,
+        description = Escape(page.description),
         keywords = page.keywords,
         favicon = if layout.favicon.is_empty() {
             format!(

src/librustdoc/html/render/mod.rs

@@ -322,7 +322,13 @@ impl AllTypes {
             if !e.is_empty() {
                 let mut e: Vec<&ItemEntry> = e.iter().collect();
                 e.sort();
-                write!(f, "<h3 id=\"{}\">{}</h3><ul class=\"{} docblock\">", title, title, class);
+                write!(
+                    f,
+                    "<h3 id=\"{}\">{}</h3><ul class=\"{} docblock\">",
+                    title.replace(' ', "-"), // IDs cannot contain whitespaces.
+                    title,
+                    class
+                );
 
                 for s in e.iter() {
                     write!(f, "<li>{}</li>", s.print());
@@ -346,7 +352,7 @@ impl AllTypes {
              </h1>",
         );
         // Note: print_entries does not escape the title, because we know the current set of titles
-        // don't require escaping.
+        // doesn't require escaping.
         print_entries(f, &self.structs, "Structs", "structs");
         print_entries(f, &self.enums, "Enums", "enums");
         print_entries(f, &self.unions, "Unions", "unions");