Replace wrong target name with valid one.
'make cluster' with enviroment variables was added after 'make cluster' in
but was not changed to 'make create-demo-cluster' in either
or Add environment variables to the demo cluster creation command.
@@ -65,11 +65,13 @@ make create-demo-cluster
source gpAux/gpdemo/gpdemo-env.sh
```
-The directory and the TCP ports for the demo cluster can be changed on the fly.
-Instead of `make cluster`, consider:
+The directory, the TCP ports, the number of segments, and the existence of
+standbys for segments and coordinator for the demo cluster can be changed
+on the fly.
+Instead of `make create-demo-cluster`, consider:
```
-DATADIRS=/tmp/gpdb-cluster PORT_BASE=5555 make cluster
+DATADIRS=/tmp/gpdb-cluster PORT_BASE=5555 NUM_PRIMARY_MIRROR_PAIRS=1 WITH_MIRRORS=false make create-demo-cluster
```
The TCP port for the regression test can be changed on the fly:
