_api.sass: use positive selector #891
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The negative selectors are very slow, causing API docs to be slower to render.
According to Chrome's devtools, all CSS selectors together on my API page took 2'372'367 match attempts. With this change it's 309'321 match attempts.
Together with #892 I'm getting 368 ms of time to render the page instead of 428 ms from a best of three experiment. I kinda expect static docs to load instantly, which means sub 300ms, but this is OK I guess.