fix creating a CacheKernel in HTTP cache documentation #9222
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Hey, I was trying out to use the HTTP Cache for a talk and lecture I am giving, and with the instructions in the HTTP Cache documentation I only got an error that the class was not found. The changes I introduced here were also necessary. However, I am not completely sure if I missed something else, since I just skimmed the documentation, but I thought I send a PR anyway so that you see what I am talking about 😃