[spanner-graph-getting-started]: Create a provisioned Spanner instance

[skeppet]

Missing backslash on second last row for code to create provisioned Spanner instance.

export SPANNER_INSTANCE_ID=graph-demo
export SPANNER_REGION=regional-us-central1
gcloud spanner instances create $SPANNER_INSTANCE_ID
--config=$SPANNER_REGION
--description="Spanner Graph demo"
--nodes=1
--edition=ENTERPRISE

Should be:

export SPANNER_INSTANCE_ID=graph-demo
export SPANNER_REGION=regional-us-central1
gcloud spanner instances create $SPANNER_INSTANCE_ID
--config=$SPANNER_REGION
--description="Spanner Graph demo"
--nodes=1
--edition=ENTERPRISE