🐛Fix docs light/dark theme switcher

[Lehoczky]

Just a simple fix for the lightbulb's tooltip on the documentation site:

Before:

After:

[Lehoczky]

Oh I see that https://fastapi.tiangolo.com/ uses the same tooltips. Should I create a PR there too, or is this intentional and not a mistake?

[ArcLightSlavik]

Looks similar if not the same? fastapi/fastapi#3246

[Lehoczky]

Maybe swapping the icons would be better too, sure. While using the light theme the bulb would be "turned on" and with the dark theme it would be "off". Makes sense to me.

However fastapi/fastapi#3246 does not fix the tooltip texts.

[Lehoczky]

Anyway, swapping the text alone seems like an improvement for me. Swapping the icons can be something for another PR.

[codecov]

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[tiangolo]

Great, thank you @Lehoczky! 🚀

And thanks for the comments @ArcLightSlavik!

[ghost]

#1 fix