docs: link docs about different PrunePropagationPolicy values (#6555)
docs: link docs about different PrunePropagationPolicy values (#6555)

This part of the documentation is not clear enough. It takes a lot of digging to actually find a clear explanation of what those policies are bringing to the end-user.

Source: https://github.com/argoproj/argo-cd/discussions/6239
Signed-off-by: Miletskyi Vladyslav <b0ee7ab8d52990689e069db653fd4e3690b05481@eu.equinix.com>
argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd,argoproj/argo-cd