docs: update content

docs/src/docPages/api/commands/set-content.md

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+# setContent
+The `setContent` command replaces the document with a new one. You can pass JSON or HTML, both work fine. It’s basically the same as setting the `content` on initialization.
+
+See also: [clearContent()](#)
+
+## Parameters
+
+`content: string`
+
+Pass a string (JSON or HTML) as [content](/guide/output). The editor will only render what’s allowed according to the [schema](/api/schema).
+
+`emitUpdate?: Boolean`
+
+By default, it doesn’t trigger the update event. Passing `true` doesn’t prevent triggering the update event.
+
+`parseOptions?: AnyObject`
+
+Options to configure the parsing can be passed during initialization and/or with setContent. Read more about parseOptions in the [ProseMirror documentation](https://prosemirror.net/docs/ref/#model.ParseOptions).
+
+## Usage
+
+```js
+this.editor.commands.setContent('<p>Example Content</p>')
+```
+