Linkify the PR in the change log. (#8790)
Linkify the PR in the change log. (#8790)


googleapis/google-cloud-python,GoogleCloudPlatform/gcloud-python,googleapis/google-cloud-python,tswast/google-cloud-python,tseaver/google-cloud-python,tswast/google-cloud-python,tseaver/google-cloud-python,tseaver/google-cloud-python,GoogleCloudPlatform/gcloud-python,tswast/google-cloud-python