Correct speech Operation docstring (#3379)
Correct speech Operation docstring (#3379)

ValueError is raised when there are no results, not when there is more than one result, which is what the docstring says.
dhermes/google-cloud-python,jonparrott/gcloud-python,tseaver/gcloud-python,tseaver/google-cloud-python,dhermes/google-cloud-python,tswast/google-cloud-python,dhermes/gcloud-python,tseaver/gcloud-python,GoogleCloudPlatform/gcloud-python,tswast/google-cloud-python,dhermes/gcloud-python,tswast/google-cloud-python,tseaver/google-cloud-python,googleapis/google-cloud-python,tartavull/google-cloud-python,jonparrott/google-cloud-python,tartavull/google-cloud-python,jonparrott/gcloud-python,dhermes/google-cloud-python,tseaver/google-cloud-python,calpeyser/google-cloud-python,GoogleCloudPlatform/gcloud-python,calpeyser/google-cloud-python,jonparrott/google-cloud-python,googleapis/google-cloud-python