Clarify some of the field descriptions on the `create_installer_windows` job

[sxa]

Clarify some of the field descriptions on the create_installer_windows (maybe others) jobs. It says JDK should be "openj9" or "hotspot" whereas the likely option now is "temurin". Also ensure that examples are provided in JDK8 and JDK11+ format. Ditto for sign_installer's "FULL_VERSION" parameter. Also sign_installer cannot directly pick up from create_installer_windows a it uses a hard coded path which does not include wix/ReleaseDir which is what comes out of the installer job.

Originally posted by @sxa in https://github.com/adoptium/adoptium/issues/155#issuecomment-1204956422