librustdoc: Use correct heading levels.

- Avoid multiple <h1>s on a page.
- The <h#> tags should follow a semantic hierarchy.
- Cap at h6 (no h7)

2 files changed, 4 insertions, 3 deletions

diff --git a/src/tools/error_index_generator/main.rs b/src/tools/error_index_generator/main.rs
index 01a3fc812b2..1ba283b1781 100644
--- a/src/tools/error_index_generator/main.rs
+++ b/src/tools/error_index_generator/main.rs
@@ -125,7 +125,8 @@ impl Formatter for HTMLFormatter {
                         &mut id_map,
                         ErrorCodes::Yes,
                         DEFAULT_EDITION,
-                        &Some(playground)
+                        &Some(playground),
+                        0
                     )
                     .into_string()
                 )?
diff --git a/src/tools/tidy/src/error_codes_check.rs b/src/tools/tidy/src/error_codes_check.rs
index 53c75a46339..ae169d383b2 100644
--- a/src/tools/tidy/src/error_codes_check.rs
+++ b/src/tools/tidy/src/error_codes_check.rs
@@ -49,7 +49,7 @@ fn check_error_code_explanation(
             } else if s.contains("compile-fail") {
                 invalid_compile_fail_format = true;
             }
-        } else if s.starts_with("#### Note: this error code is no longer emitted by the compiler") {
+        } else if s.starts_with("### Note: this error code is no longer emitted by the compiler") {
             if !found_error_code {
                 error_codes.get_mut(&err_code).map(|x| x.has_test = true);
                 found_error_code = true;
@@ -64,7 +64,7 @@ fn check_if_error_code_is_test_in_explanation(f: &str, err_code: &str) -> bool {
 
     for line in f.lines() {
         let s = line.trim();
-        if s.starts_with("#### Note: this error code is no longer emitted by the compiler") {
+        if s.starts_with("### Note: this error code is no longer emitted by the compiler") {
             return true;
         }
         if s.starts_with("```") {