Minor mismatch in file names in docs for step: Create Hasura Metadata

### Component
Docs

### What is the current behaviour?
For [this step](https://hasura.io/docs/3.0/getting-started/build/connect-to-data/create-source-metadata#step-1-create-the-hasura-metadata), the file referenced is `.env.my_subgraph.local` in the explanation, but the code snippet shows the file as `my_subgraph/.env.my_subgraph` (`.local` is missing the code snippet file name).

### What is the expected behaviour?
The file name should be the same

### How to reproduce the issue?

1. Navigate to the [step: Create Hasura Metadata](https://hasura.io/docs/3.0/getting-started/build/connect-to-data/create-source-metadata#step-1-create-the-hasura-metadata)
2. Read the snippet telling the user to update the environments

### Screenshots or Screencast

### Please provide any traces or logs that could help here.
None

### Any possible solutions/workarounds you're aware of?
None

### Keywords

Open the linked “Create Hasura Metadata” documentation step and compare the explanation's `.env.my_subgraph.local` with the code snippet's `my_subgraph/.env.my_subgraph`. Update the mismatched filename in the snippet, then reread the step to confirm both references match.

Written by the indexing model from the issue text.