id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1537068105,I_kwDOAMm_X85bncxJ,7450,Backend array documentation typo,14371165,open,0,,,0,2023-01-17T21:37:26Z,2023-01-17T21:56:12Z,,MEMBER,,,,"### What happened?

https://docs.xarray.dev/en/stable/internals/how-to-add-new-backend.html#indexing-examples

I believe there's a typo in the BASIC indexing support example:
```python
# shall support integers
backend_array._raw_indexing_method(1, 1)
```

Should be:
```python
# shall support integers
backend_array._raw_indexing_method((1, 1))
```

Suggestion of possible fixes:
* Make sure it is a typo.
* Create a valid custom MyBackendArray and initialize it. So it is easier to tell if it's a typo.
* Add type hinting so mypy can easier catch these errors.

### What did you expect to happen?

_No response_

### Minimal Complete Verifiable Example

_No response_

### MVCE confirmation

- [ ] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
- [ ] Complete example — the example is self-contained, including all data and the text of any traceback.
- [ ] Verifiable example — the example copy & pastes into an IPython prompt or [Binder notebook](https://mybinder.org/v2/gh/pydata/xarray/main?urlpath=lab/tree/doc/examples/blank_template.ipynb), returning the result.
- [ ] New issue — a search of GitHub Issues suggests this is not a duplicate.

### Relevant log output

_No response_

### Anything else we need to know?

_No response_

### Environment

<details>



</details>
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