docs: Add agd query vstorage keys command reference (#1122)

Author: ansabgillani

main/guides/agoric-cli/agd-query-tx.md

@@ -118,7 +118,7 @@ $ agd query bank balances $addr -o json
 
 ## agd query gov proposals
 
-Query for a all paginated proposals that match optional filters:
+Query for a all paginated proposals that match optional filters.
 
 Example:
 
@@ -130,6 +130,17 @@ $ agd query gov proposals --output json | \
 ["3","2023-11-14T17:44:37.432643476Z","PROPOSAL_STATUS_PASSED"]
 ```
 
+## agd query vstorage keys
+
+Query for the data residing at specified path in VStorage.
+
+Example:
+```
+$ agd query vstorage keys 'published.vaultFactory.managers.manager0.vaults'
+children:
+- vault0
+```
+
 ## Transaction Commands
 
 Making transactions requires setting up an **account** with a private key for signing. The [basic dapp local chain](../getting-started/#starting-a-local-agoric-blockchain) container has a number of keys set up for use with `--keyring-backend=test`. Use `agd keys list --keyring-backend=test` to see them.