[MNT] - Fix power spectrum plot ylabel formatting #339
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Currently, the default y-label for a PSD plot is the string literal 'Power (V^2/Hz)', which isn't properly formatted to display the superscript exponent.
This PR updates the formatting, to actually use a superscript, so the plot label now looks like this:

I think the only thing to consider / check is whether there is some reason this formatting might not work across systems(?). It works smoothly for me - would be good if someone else could check it renders properly.