Update Pipeline Caching doc to clarify s needed for checkout: self.

[nickshanks347]

When running a pipeline, I believe checkout: self is ran by default even if not explicitly written in the pipeline. The docs stated that the .yarn folder variable should be equal to $(Pipeline.Workspace)/.yarn, this isn't correct as checkout: self checks out to $(Pipeline.Workspace)/s, so the variable should be set to $(Pipeline.Workspace)/s/.yarn.

Hopefully this fixes issue https://github.com/microsoft/azure-pipelines-tasks/issues/12892 so people are not unsure in the future.

Maybe an additional point should be added about how if not using checkout: self (i.e. using checkout: my-repo) then the variable should be $(Pipeline.Workspace)/my-repo

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[Jak-MS]

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