Make the apostrophe uniform
Make the apostrophe uniform

Signed-off-by: machinly <6b1fadba6be72e3786c7d9991e9f24601513048a@acm.org>

GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,GoogleCloudPlatform/alertmanager,prometheus/alertmanager,prometheus/alertmanager,prometheus/alertmanager,prometheus/alertmanager,GoogleCloudPlatform/alertmanager