Change dev listener example to use global address

vault/content.md

@@ -37,12 +37,12 @@ This runs a completely in-memory Vault server, which is useful for development b
 When running in development mode, two additional options can be set via environment variables:
 
 -	`VAULT_DEV_ROOT_TOKEN_ID`: This sets the ID of the initial generated root token to the given value
--	`VAULT_DEV_LISTEN_ADDRESS`: This sets the IP:port of the development server listener
+-	`VAULT_DEV_LISTEN_ADDRESS`: This sets the IP:port of the development server listener (defaults to 0.0.0.0:8200)
 
 As an example:
 
 ```console
-$ docker run --cap-add=IPC_LOCK -e 'VAULT_DEV_ROOT_TOKEN_ID=myroot' -e 'VAULT_DEV_LISTEN_ADDRESS=127.0.0.1:1234' vault
+$ docker run --cap-add=IPC_LOCK -e 'VAULT_DEV_ROOT_TOKEN_ID=myroot' -e 'VAULT_DEV_LISTEN_ADDRESS=0.0.0.0:1234' vault
 ```
 
 ## Running Vault in Server Mode