Updated Behind the scene network requests (markdown)

Behind-the-scene-network-requests.md

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 ### What are behind-the-scene network requests
 
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+_Behind-the-scene_ network requests are those network requests which µBlock can not associate with a specific tab opened in your browser: these requests come from _somewhere_, but µBlock is missing information to report exactly from here.
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+All network requests without a specific origin are classified as _behind-the-scene_. Typically, all blockers will ignore and automatically whitelist behind-the-scene network requests.
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+For the Chromium browser, examples of behind-the-scene network requests:
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+- Requests made by the browser to update extensions
+- Requests made by the browser because of specific functionality, like the setting _"Use a prediction service to help complete searches and URLs typed in the address bar"_
+- Requests made by installed extensions for good or bad reasons (µBlock makes such requests, to fetch the filter lists when they need to be updated)