update the heading page

docs/src/demos/Extensions/Heading/index.spec.js

@@ -45,4 +45,33 @@ context('/api/extensions/heading', () => {
       .find('h3')
       .should('contain', 'Example Text')
   })
+
+  it('the button should toggle the headline', () => {
+    cy.get('.ProseMirror h1')
+      .should('not.exist')
+
+    cy.get('.demo__preview button:nth-child(1)')
+      .click()
+
+    cy.get('.ProseMirror')
+      .find('h1')
+      .should('contain', 'Example Text')
+
+    cy.get('.demo__preview button:nth-child(1)')
+      .click()
+
+    cy.get('.ProseMirror h1')
+      .should('not.exist')
+  })
+
+  it('should make a headline from the default markdown shortcut', () => {
+    cy.get('.ProseMirror').then(([{ editor }]) => {
+      editor.clearContent()
+    })
+
+    cy.get('.ProseMirror')
+      .type('# Headline')
+      .find('h1')
+      .should('contain', 'Headline')
+  })
 })

docs/src/docPages/api/extensions/heading.md

@@ -1,5 +1,5 @@
 # Heading
-The Heading extension adds support for headlines. Headlines are rendered with `<h1>` to `<h6>` HTML tags. By default six headline levels are enabled, but you can pass an array to only allow a few levels, see an example below.
+The Heading extension adds support for headings of different levels. Headings are rendered with `<h1>`, `<h2>`, `<h3>`, `<h4>`, `<h5>` or `<h6>` HTML tags. By default all six headline levels are enabled, but you can pass an array to only allow a few levels. Check the usage example to see how this is done.
 
 Type `# ​` at the beginning of a new line and it will be magically transformed to a headline, same for `## ​`, `### ​`, `#### ​`, `##### ​` and `###### ​`.
 

docs/src/links.yaml

@@ -136,7 +136,6 @@
           link: /api/extensions/hard-break
         - title: Heading
           link: /api/extensions/heading
-          draft: true
         - title: History
           link: /api/extensions/history
         - title: HorizontalRule