added manifest documentation for windows cells
added manifest documentation for windows cells

[#127397145]

Signed-off-by: James Myers <44cbd4b2784f900a6fede6279d0b7fdcbfaa89f5@pivotal.io>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release