docs: update the key calculation expression of proxy cache #8316
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Description
In the description of Proxy Cache, it is explained that the cache key is calculated using the following expression.
However, in the source code of Proxy Cache (3.9.0), the cache key is calculated from the following five elements.
https://github.com/Kong/kong/blob/3.9.0/kong/plugins/proxy-cache/cache_key.lua#L111-L112
Because of that, I have updated the expression in the documentation to match it with the one of source code.
Testing instructions
Preview link:
Checklist