Add more information about inspecting the original certificate

[ameshkov]

In this article we explain that there's a "Browser Assistant" that allows inspecting the original certificate: https://adguard.com/kb/general/https-filtering/known-issues/#inspecting-the-original-certificate

Nowadays we added another option to do that, the user can visit "Recent activity" (filtering log in some versions) and inspect the original certificate from there. The advantage here is that with Browser Assistant you can only see the cert of the website and from recent activity you can inspect certificate of any server used in a subrequest (or from a browser that does not have a browser assistant).

In addition to that, please add screenshots that explain how it looks like.

• Browser Assistant:
• Filtering log from Win / macOS apps.
• Recent activity from Android app.