add keyboardShortcut and enter command

docs/src/demos/Examples/Default/index.vue

@@ -1,21 +1,6 @@
 <template>
   <div>
     <div v-if="editor">
-      <button
-        @click="editor
-          .can()
-          .chain()
-          .focus()
-          .enter()
-          .insertText('1')
-          .enter()
-          .insertText('2')
-          .enter()
-          .insertText('3')
-          .run()"
-      >
-        enter
-      </button>
       <button @click="editor.chain().focus().toggleBold().run()" :class="{ 'is-active': editor.isActive('bold') }">
         bold
       </button>

docs/src/docPages/api/commands.md

@@ -177,7 +177,9 @@ Have a look at all of the core commands listed below. They should give you a goo
 | .blur()               | Removes focus from the editor.          |
 | .deleteRange()        | Delete a given range.                   |
 | .deleteSelection()    | Delete the selection, if there is one.  |
+| .enter()              | Trigger enter.                          |
 | .focus()              | Focus the editor at the given position. |
+| .keyboardShortcut()   | Trigger a keyboard shortcut.            |
 | .scrollIntoView()     | Scroll the selection into view.         |
 | .selectAll()          | Select the whole document.              |
 | .selectNodeBackward() | Select a node backward.                 |