Update to 13.0 release notes.
Update to 13.0 release notes.



Former-commit-id: 7a98d997968211aefe794ce572c5e387be579d0e
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine