`_toc.yml` example in docs is incompatible

[michaelosthege]

Describe the bug

@AakashGfude

I'm trying to understand how to use sphinx-multitoc-numbering with Jupyter book, but the _toc.yml example in the documentation uses an outdated format.

I tried different variations but none of them render.

Reproduce the bug

Take the example from the docs & paste it into a _toc.yml.

Attempting to build gives The Table of Contents file is malformed: toc is not a mapping: <class 'list'>

List your environment

Jupyter Book      : 0.12.2
External ToC      : 0.2.3
MyST-Parser       : 0.15.2
MyST-NB           : 0.13.1
Sphinx Book Theme : 0.1.10
Jupyter-Cache     : 0.4.3
NbClient          : 0.5.13

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