Update notes on IHttpClientFactory and cookies #45658
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There seems to be a confusion around the reasons why we advise against HttpClientFactory when the app needs to use cookies. dotnet/dotnet-api-docs#10770 and dotnet/dotnet-api-docs#1535 imply that users often think the problem might be related to
CookieContainer
thread safety which is not the case.This PR updates the notes, describing the actual reasons: cookie leaking and unexpected recycling of cookies.
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