Multiple locations in the github workflows point to `validation-jobs.yml` as the location for the cache restore keys, but it was moved to `update-caches.yml`

[hukasu]

How can Bevy's documentation be improved?

Multiple locations say that the key creation for cache-restore is done on validation-jobs.yml but the code that does that is now found on update-caches.yml

Example

bevy/.github/workflows/ci.yml

Lines 40 to 43 in 008ca5d

	# See .github/workflows/validation-jobs.yml for how keys are generated
	restore-keys: |
	${{ runner.os }}-stable--${{ hashFiles('**/Cargo.toml') }}-
	${{ runner.os }}-stable--