Add documentation of serviceAnnotations
Add documentation of serviceAnnotations

Signed-off-by: Jeff Wenzbauer <f6d83bbbfeaecba999017f49f5c5bfef087a4055@gmail.com>

jetstack/cert-manager,cert-manager/cert-manager,cert-manager/cert-manager,cert-manager/cert-manager,jetstack/cert-manager,jetstack/cert-manager