rename a bunch of "nch" to "nh".

src/cm.rs

@@ -357,7 +357,7 @@ impl<'a, 'o, 'c> CommonMarkFormatter<'a, 'o, 'c> {
             NodeValue::DescriptionItem(..) => (),
             NodeValue::DescriptionTerm => (),
             NodeValue::DescriptionDetails => self.format_description_details(entering),
-            NodeValue::Heading(ref nch) => self.format_heading(nch, entering),
+            NodeValue::Heading(ref nh) => self.format_heading(nh, entering),
             NodeValue::CodeBlock(ref ncb) => self.format_code_block(node, ncb, entering),
             NodeValue::HtmlBlock(ref nhb) => self.format_html_block(nhb, entering),
             NodeValue::ThematicBreak => self.format_thematic_break(entering),
@@ -538,9 +538,9 @@ impl<'a, 'o, 'c> CommonMarkFormatter<'a, 'o, 'c> {
         }
     }
 
-    fn format_heading(&mut self, nch: &NodeHeading, entering: bool) {
+    fn format_heading(&mut self, nh: &NodeHeading, entering: bool) {
         if entering {
-            for _ in 0..nch.level {
+            for _ in 0..nh.level {
                 write!(self, "#").unwrap();
             }
             write!(self, " ").unwrap();

src/html.rs

@@ -619,15 +619,15 @@ fn render_heading<'a, T>(
     node: &'a AstNode<'a>,
     entering: bool,
 ) -> io::Result<ChildRendering> {
-    let NodeValue::Heading(ref nch) = node.data.borrow().value else {
+    let NodeValue::Heading(ref nh) = node.data.borrow().value else {
         unreachable!()
     };
 
     match context.plugins.render.heading_adapter {
         None => {
             if entering {
                 context.cr()?;
-                write!(context, "<h{}", nch.level)?;
+                write!(context, "<h{}", nh.level)?;
                 render_sourcepos(context, node)?;
                 context.write_all(b">")?;
 
@@ -644,15 +644,15 @@ fn render_heading<'a, T>(
                     )?;
                 }
             } else {
-                writeln!(context, "</h{}>", nch.level)?;
+                writeln!(context, "</h{}>", nh.level)?;
             }
         }
         Some(adapter) => {
             let mut text_content = Vec::with_capacity(20);
             collect_text(node, &mut text_content);
             let content = String::from_utf8(text_content).unwrap();
             let heading = HeadingMeta {
-                level: nch.level,
+                level: nh.level,
                 content,
             };
 

src/xml.rs

@@ -183,8 +183,8 @@ impl<'o, 'c> XmlFormatter<'o, 'c> {
                 NodeValue::DescriptionItem(..) => (),
                 NodeValue::DescriptionTerm => {}
                 NodeValue::DescriptionDetails => {}
-                NodeValue::Heading(ref nch) => {
-                    write!(self.output, " level=\"{}\"", nch.level)?;
+                NodeValue::Heading(ref nh) => {
+                    write!(self.output, " level=\"{}\"", nh.level)?;
                 }
                 NodeValue::CodeBlock(ref ncb) => {
                     if !ncb.info.is_empty() {