Incorrect instruction and cli for connecting to subgraph given there are multiple subgraphs

Issue can be replicated when there are multiple subgraphs.
Initialising connector to a subgraph named: agblog_subgraph. Instead of providing **subgraph name** in cli we need to **define the path** of subgraph.yaml for respective subgraph.
Example
ddn connector init agblog_mysql --subgraph `agblog_subgraph/subgraph.yaml` --hub-connector hasura/mysql

This [doc](https://hasura.io/connectors/mysql) suggests just the name.
`ddn connector init my_mysql --subgraph my_subgraph --hub-connector hasura/MySQL
`
Here is the error when just the subgraph name is mentioned as per the instruction

Start with the linked MySQL connector documentation and the `ddn connector init` CLI entry point. Compare the documented subgraph argument with behavior when multiple subgraphs exist; done when the CLI and instructions consistently accept or describe the correct subgraph reference.

Written by the indexing model from the issue text.