Use <h2> instead of <div> on Subhead-heading docs (#1953)

.changeset/shaggy-coats-relate.md

@@ -0,0 +1,5 @@
+---
+"@primer/css": patch
+---
+
+Use <h2> instead of <div> on Subhead-heading docs

docs/content/components/subhead.md

@@ -8,29 +8,29 @@ bundle: subhead
 ---
 
 
-The basic Subhead consists of a `.Subhead` container, which has a light gray bottom border. Use `.Subhead-heading` for the heading itself. It's an `<h2>` sized heading with normal font-weight.
+The basic Subhead consists of a `.Subhead` container, which has a light gray bottom border. Use `.Subhead-heading` for the heading itself. It is styled as an `<h2>` sized heading with normal font-weight.
 
 Use a heading element whenever possible as they can be used as navigation for assistive technologies, and avoid skipping levels.
 
 ```html live title="Subhead"
 <div class="Subhead">
-  <div class="Subhead-heading">Plain subhead</div>
+  <h2 class="Subhead-heading">Plain subhead</h2>
 </div>
 ```
 
 To add a top margin to the Subhead, use `.Subhead--spacious`. This is useful for separating sections on a settings page.
 
 ```html live title="Spacious Subhead"
 <div class="Subhead Subhead--spacious">
-  <div class="Subhead-heading">Spacious subhead</div>
+  <h2 class="Subhead-heading">Spacious subhead</h2>
 </div>
 ```
 
 You can add a one line description to the subhead with `.Subhead-description`.
 
 ```html live title="Subhead with description"
 <div class="Subhead">
-  <div class="Subhead-heading">Subhead with description</div>
+  <h2 class="Subhead-heading">Subhead with description</h2>
   <div class="Subhead-description">The subhead is a subdued header style with a light bottom border.</div>
 </div>
 ```
@@ -39,7 +39,7 @@ For longer descriptions, it is recommended that you use a paragraph below the Su
 
 ```html live  title="Subhead with longer description"
 <div class="Subhead">
-  <div class="Subhead-heading">Plain subhead</div>
+  <h2 class="Subhead-heading">Plain subhead</h2>
 </div>
 <p>
   This is a longer description that is sitting below the Subheader. It's much longer than a description that could sit comfortably in the Subhead. It might even have <strong>bold</strong> text. <a href="#">Click to learn more.</a>
@@ -50,12 +50,12 @@ You can add a button or something to the right of `.Subhead-heading` with the `.
 
 ```html live title="Subhead with actions"
 <div class="Subhead">
-  <div class="Subhead-heading">Subhead with button</div>
+  <h2 class="Subhead-heading">Subhead with button</h2>
   <div class="Subhead-actions"><a href="#url" class="btn btn-sm btn-primary" role="button">Action</a></div>
 </div>
 
 <div class="Subhead Subhead--spacious">
-  <div class="Subhead-heading">Subhead with link</div>
+  <h2 class="Subhead-heading">Subhead with link</h2>
   <div class="Subhead-actions"><a href="#url">Learn more</a></div>
 </div>
 ```
@@ -64,7 +64,7 @@ Use all the elements together to create a Subhead with actions and a description
 
 ```html live title="Subhead with actions and description"
 <div class="Subhead">
-  <div class="Subhead-heading">Subhead with actions and description</div>
+  <h2 class="Subhead-heading">Subhead with actions and description</h2>
   <div class="Subhead-actions"><a href="#url" class="btn btn-sm btn-primary" role="button">Action</a></div>
   <div class="Subhead-description">The subhead is a subdued header style with a light bottom border.</div>
 </div>
@@ -74,6 +74,6 @@ Use the `.Subhead-heading--danger` modifier to make the text bold and red. This
 
 ```html live title="Subhead danger"
 <div class="Subhead">
-  <div class="Subhead-heading Subhead-heading--danger">Danger zone</div>
+  <h2 class="Subhead-heading Subhead-heading--danger">Danger zone</h2>
 </div>
 ```