add plex docs

Author: qiaofeng1227

i18n/en/docusaurus-plugin-content-docs/version-2.0/apps/plex.md

@@ -15,11 +15,11 @@ import Meta from './_include/plex.md';
 
 ### Initial setup{#wizard}
 
-1. After installing Plex Media Server on the Websoft9 console, view the application details through **My Applications** and obtain the access URL in the **Access** tab 
+1. After installing Plex Media Server on the Websoft9 console, view the application details through **My Applications** and obtain the access URL in the **Access** tab. 
 
-2. When accessing the URL in a local browser, it will redirect to the [Plex official website](https://app.plex.tv) to guide you through registration 
+2. When accessing the URL in a local browser, it will redirect to the [Plex official website](https://app.plex.tv) to guide you through registration. 
 
-3. After completing the registration, you can watch TV and movie programs
+3. After completing the registration, you can watch TV and movie programs.
 
 ## Configuration options{#configs}