docs: add script documentation
docs: add script documentation

[#171366755](https://www.pivotaltracker.com/story/show/171366755)

Co-authored-by: Aidan Obley <2667fa8e8663c9d9f622cbe0896041b5635a919f@vmware.com>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release