Fix dg CLI install command in auto implement docs (#25311)

## Summary
- Correct the dg CLI install command from `dagster-dg` to
`dagster-dg-cli` in the auto implement docs.

## Testing

Internal-RevId: 2e1d7c5123bb08749e897035052d7006343e41ce

Author: cmpadden

docs/docs/guides/labs/dagster-ai/auto-implement.md

@@ -16,7 +16,7 @@ From any [Issue](/guides/labs/issues), you can dispatch an AI coding agent to pl
 
 - A Dagster+ organization with [Dagster+ AI](/guides/labs/dagster-ai) enabled
 - A GitHub App installation connected to your organization
-- The `dg` CLI installed (`pip install dagster-dg`)
+- The `dg` CLI installed (`pip install dagster-dg-cli`)
 - An [Anthropic API key](https://console.anthropic.com/)
 
 ## Setup