[Doc] Update *Overview of Connector* (#5183)
[Doc] Update *Overview of Connector* (#5183)

Fix https://github.com/apache/pulsar/issues/5015
massakam/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,massakam/pulsar,merlimat/pulsar,yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar