docs: "outpus" should be "outputs"

[zmoon]

spotted this little typo:

https://github.com/executablebooks/MyST-NB/blob/446cf0d269a0906eacc1b88b418c7bce40ee4cee/myst_nb/render_outputs.py#L1

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[choldgraf]

ah yes - thanks for noticing! Want to try tackling it with a PR? I am happy to review!

[zmoon]

Sure!