docs(yard): make it visible that props are hoverable

[gergelyke]

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[chasestarr]

I'm fine with testing out this icon, but I do feel it's a bit overwhelming to see it all over the place. Once a website visitor uses the feature once, the know it forever. Not sure if something more subtle is appropriate like an underline

[sandgraham]

i think i agree with using an underline like @chasestarr suggested. i can't really make out the question mark in the circle- but then again i'm not wearing my glasses.

[gergelyke]

@chasestarr @sandgraham makes perfect sense, just updated the PR