docs(en): fix typos and improve wording (#980)

packages/artplayer-vitepress/docs/en/advanced/built-in.md

@@ -314,7 +314,7 @@ Manage the subtitle features of the player
 - `switch` method sets the current subtitle address and options
 - `textTrack` Get the current subtitle track
 - `activeCues` Get the currently active subtitle list
-- `cues` Get the the subtitle list
+- `cues` Get the subtitle list
 
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packages/artplayer-vitepress/docs/en/advanced/plugin.md

@@ -2,7 +2,7 @@
 
 Once you know the player's `properties`, `methods`, and `events`, writing plugins is very simple.
 
-You can load the plugin functions when instantiated.
+You can load plugin functions during instantiation.
 
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@@ -28,9 +28,7 @@ art.on('ready', () => {
     console.info(art.plugins.myPlugin);
 });
 ```
-Here's the translation of the provided text into English while preserving the Markdown formatting:
-
-A function that allows loading plugins after instantiation
+You can also load plugins after instantiation:
 
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