Remove references to google.cloud.operation from spanner #3625
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Spanner's docstrings were actually incorrect, as spanner is using gax futures but was documented as using google.cloud.operation. gax futures will be replaced by google.cloud.future.operation and in the meantime the interface is the same. This change removes references to google.cloud.operation.
This is not a breaking change for spanner.
Towards #3617