Backend array documentation typo

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:

# shall support integers
backend_array._raw_indexing_method(1, 1)

Should be:

# 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, 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

Open the linked xarray documentation page at the BASIC indexing support example and compare the shown _raw_indexing_method call with the surrounding indexing guidance. Verify whether the argument should be a tuple, then update the example if confirmed and check the rendered documentation for the corrected syntax.