rustdoc: use better, consistent SVG icons for scraped examples

This continues two ongoing projects:

- Replacing ascii art with real icons that don't look like
  syntax, are understandable to people who're familiar with
  desktop computers and smart devices, and aren't ugly.
- Using labels and tooltips to clarify these icons, when the
  limits of popular iconography hit us. In this case, I've added
  tooltips, because, unfortunately, there's not room for
  always-visible labels.

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