Prefix caching documentation link points to google.com in the README.md

[ialbrecht]

https://github.com/openvinotoolkit/openvino.genai/blob/master/README.md?plain=1#L41

[Wovchena]

I believe this is intentional joke

[ialbrecht]

Not so sure about it. Commit title says Readme draft.

Otherwise I didn't get the joke.....

PS. letmegooglethat is a bit better

[Wovchena]

I explained absence of letbegooglethat to myself with the idea that no one asked for a link. We a giving it on our own, so it could feel toxic :)

In any case I'm not familiar with prefix caching, so I can't propose a better source. Maybe @ilya-lavrenov