fix some doc's bug (with v0.57.1) (#3393)

* fix: code blocks's info string
this info string. should be `jsx`

* fix: editor's exec invoke
now, editor.exec() is not available in Slate v0.57.1
so, use editor.insertText() to instead it

*  refactor: delete a nerver used value

* update add new chinese translate
      update chinese translate to `v0.57.1`

Co-authored-by: Ian Storm Taylor <ian@ianstormtaylor.com>

docs/walkthroughs/01-installing-slate.md

@@ -16,10 +16,10 @@ _Note, if you'd rather use a pre-bundled version of Slate, you can `yarn add sla
 
 Once you've installed Slate, you'll need to import it.
 
-```js
+
+```jsx
 // Import React dependencies.
 import React, { useEffect, useMemo, useState } from "react";
-
 // Import the Slate editor factory.
 import { createEditor } from 'slate'
 
@@ -102,7 +102,7 @@ There's only one last step. So far we've been using an empty `[]` array as the i
 
 The value is just plain JSON. Here's one containing a single paragraph block with some text in it:
 
-```js
+```jsx
 const App = () => {
   const editor = useMemo(() => withReact(createEditor()), [])
   // Add the initial value when setting up our state.