Fix typo in exported param type name. (#7295)
Fix typo in exported param type name. (#7295)

Closes #7125.
tswast/google-cloud-python,tswast/google-cloud-python,tswast/google-cloud-python,GoogleCloudPlatform/gcloud-python,tseaver/google-cloud-python,googleapis/google-cloud-python,googleapis/google-cloud-python,tseaver/google-cloud-python,tseaver/google-cloud-python,GoogleCloudPlatform/gcloud-python