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plugin_services.md: update sample plugin doc

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topics/basics/plugin_structure/plugin_services.md
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@ -118,13 +118,9 @@ This minimal sample shows [Light Service](#light-services) `ProjectService` inte
## Sample Plugin
This sample plugin illustrates how to create and use a plugin service.
To clarify how to use services, consider the **maxOpenProjects** sample plugin available in the [code samples](https://github.com/JetBrains/intellij-sdk-code-samples/tree/main/max_opened_projects).
This plugin has an application service counting the number of currently opened projects in the IDE.
If this number exceeds the maximum number of simultaneously opened projects allowed by the plugin, it displays a warning message.
If this number exceeds the maximum number of simultaneously opened projects allowed by the plugin (3), it displays a warning message.
**To install and run the sample plugin**
* Download the included sample plugin project located [here](https://github.com/JetBrains/intellij-sdk-code-samples/tree/main/max_opened_projects).
* Start IntelliJ IDEA, on the starting page, click <control>Open Project</control>, and then use the dialog box to open the project.
* On the main menu, choose <menupath>Run | Run</menupath> or press <shortcut>Shift+F10</shortcut>.
* If necessary, change the [Run/Debug Configurations](https://www.jetbrains.com/help/idea/run-debug-configuration-plugin.html).
See [Code Samples](code_samples.md) on how to set up and run the plugin.