Typo in 'Other extensions` docs

[williamhobbs]

I think niryo-one-python-generators.ts in this line should instead be niryo-one-python-generators.js.

jupyterlab-blockly/docs/other_extensions.md

Line 111 in a821459

**NOTE** : `BlocklyNiryo` is defined in `niryo-one-python-generators.ts`.