Update caching-dependencies-to-speed-up-workflows.md

[zhughes3]

just cleaning up some comments and names for the clean up cache docs

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actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13

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[Sharra-writes]

I don't see a reason not to do this. The name is a little more descriptive and it should be "keys" in the echo. I'll get it added to the merge queue once checks are passing.

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