docs: update node option type (#7199)

Author: snitin315

src/content/configuration/node.mdx

@@ -21,7 +21,7 @@ W> As of webpack 5, You can configure only `global`, `__filename` or `__dirname`
 
 ## node
 
-`boolean: false` `object`
+`false` `object`
 
 **webpack.config.js**
 
@@ -36,7 +36,7 @@ module.exports = {
 };
 ```
 
-Since webpack 3.0.0, the `node` option may be set to `false` to completely turn off the `NodeStuffPlugin` plugin.
+The `node` option may be set to `false` to completely turn off the `NodeStuffPlugin` plugin.
 
 ## node.global