Update website documentation to include required arguments when creating a topic

In the quickstart documentation (quickstart_createtopic) , there is a command specified to create a topic:

$ bin/kafka-topics.sh --create --topic quickstart-events --bootstrap-server localhost:9092

However, it is no longer working due to missing arguments:

• partitions
• replications-factor

The previous command should be replaced with this one:

$ bin/kafka-topics.sh --create --topic quickstart-events --bootstrap-server localhost:9092 --partitions 1 --replication-factor 1