caching-dependencies-to-speed-up-workflows.md: clarify base of a relative path
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### Why:
Closes https://github.com/github/docs/issues/12852.
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Caching dependencies to speed up workflows: misleading documentation about using relative paths in actions/cache@v2
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### Code of Conduct
- [X] I have read and agree to the GitHub Docs project's [Code of Conduct](https://github.com/github/docs/blob/main/CODE_OF_CONDUCT.md)
### What article on docs.github.com is affected?
https://docs.github.com/en/actions/advanced-guides/caching-dependencies-to-speed-up-workflows
### What part(s) of the article would you like to see updated?
In the "Using the cache action" section, under "Input parameters for the cache action":
> `path`: Required The file path on the runner to cache or restore. The path can be an absolute path or relative to the working directory.
The "relative to the working directory" part is misleading. The base of a relative path is in fact the GitHub workspace directory; it is not affected by `run.working_directory` of the step. I found this out in a job where I have a custom `defaults.run.working_directory`.
### Additional information
_No response_