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GH-35779: [R][Documentation] Document workaround for window-like functionality (#35702)

Issue #29537 describes how to perform an implicit window function. 

It was discussed on the mailing list: https://lists.apache.org/thread/b16ghtb8q9hyl64ks3dp9ftm7pvlnsdk to document this operation in the vignette. It's still not clear if this is a preferred way to apply these operations, but there is potential for significant performance on large data sets

* Closes: #35779

Lead-authored-by: David Greiss <dgreiss@users.noreply.github.com>
Co-authored-by: eitsupi <50911393+eitsupi@users.noreply.github.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>