[Doc] Add information for RocksDB and ETCD #13830
Merged
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This update works for #12776 and #13225.
Modifications
Add RocksDB (standalone only) and ETCD as alternative metadata backend services in the "Architecture" topic.

Preview
Replace "ZooKeeper" with "RocksDB" in the "Set up a standalone Pulsar" topic, and add reference information about configurations of Rocksdb.

Preview
Add the

metadataStoreConfigPathparameter of RocksDB in the Standalone configurations.Preview
Documentation
doc