Tooltip: make syntax less verbose

Currently adding tooltips is quite verbose, especially if there are several in a component:
```

Tooltip Text

```

It would be helpful if this could be more condensed:
```
} title="My tooltip">

```
cc: @fneves

Start at the Tooltip component and inspect its current Trigger and Content API, then review existing tooltip usages in the component library. Done means the condensed trigger/title form shown in the issue works while the existing tooltip behavior remains available; add or update the relevant component tests if they exist.

Written by the indexing model from the issue text.