Update documentation for CI cache key when using files
What does this MR do?
Update documentation for CI cache:key:files and cache:key:prefix with the feature changes from !19392 (merged)
We require at least one file in the cache:key:files entry and we use all the given files when building the cache key. We gather the most recent commit for each file and compute a SHA of those we can find.
Related issues
issue: #18986 (closed)
Merge request that introduced changes: !19392 (merged)
Author's checklist
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