Fix TypeScript-related instructions in plugins development documentation (#1779)

* fix 2 mistakes

* plugin section init

* Revert "plugin section init"

This reverts commit 295ab54.

Author: Boegie19

Diff for: docusaurus/docs/dev-docs/plugins-development.md

@@ -57,15 +57,15 @@ Strapi provides a [command line interface (CLI)](/dev-docs/cli) for creating plu
 </TabItem>
 </Tabs>
 
-7. (*TypeScript-specific*) Run `npm install` or `yarn` in the newly-created plugin directory.
+7. Run `npm install` or `yarn` in the newly-created plugin directory.
 8. (*TypeScript-specific*) Run `yarn build` or `npm run build` in the plugin directory. This step transpiles the TypeScript files and outputs the JavaScript files to a `dist` directory that is unique to the plugin.
 9. Run `yarn build` or `npm run build` at the project root.
 10. Run `yarn develop` or `npm run develop` at the project root.
 
 Plugins created using the preceding directions are located in the `plugins` directory of the application (see [project structure](/dev-docs/project-structure)).
 
 :::note
-During plugin development it is helpful to use the `--watch-admin` flag to toggle hot reloading of the admin panel. See the [Admin panel customization](/dev-docs/admin-panel-customization) documentation for more details. (TypeScript specific) While developing your plugin, you can run `yarn develop` or `npm run develop` in the plugin directory to watch the changes to the TypeScript server files.
+During plugin development it is helpful to use the `--watch-admin` flag to toggle hot reloading of the admin panel. See the [Admin panel customization](/dev-docs/admin-panel-customization) documentation for more details. (TypeScript specific) While developing your plugin, you can run `yarn develop --watch-admin` or `npm run develop -- --watch-admin` in the plugin directory to watch the changes to the TypeScript server files.
 :::
 
 :::tip