Use `@default` instead of `@example` in docs

See: https://github.com/zurb/foundation-sites/issues/9464

Problem: `@example` values are presented as default in the
documentation, and there is no way to get the default value
automatically. Plus, the "example" value is often not relevant at all.

> The reference section at the bottom is mostly meant to be a reference
> —key plugin options should be documented in the main body of the
> documentation, where there's more room to elaborate on things.
> -- @gakimball

Fix:
- Use `@default` instead of `@example`
- Make values in comment equal to the options default values

Warning: This require to update the value used to generate Js reference
in foundation-docs.

Replaced values:

Tooltip:
- `templateClasses`: `'my-cool-tip-class'` replaced to `''`
- `template`: `'<div class="tooltip"></div>'` replaced to
`''`
- `tip` text: `'Some cool space fact here.'` replaced to `''`
- `positionClass`: `'top'` replaced to `''`

Sticky:
- `container`: `'<div data-sticky-container class="small-6
columns"></div>'` replaced to `'<div
data-sticky-container></div>'`
- `anchor`: `'exampleId'` replaced to `''`
- `topAnchor`: `'exampleId:top'` replaced to `''`
- `btmAchor`: `'exampleId:bottom'` replaced to `''`
- `checkEvery`: `50` replaced to `-1`

Reveal:
- `animationIn`: `'slide-in-left'` replaced to `''`
- `animationOut`: `'slide-in-left'` replaced to `''`
- `showDelay`: `10` replaced to `0`
- `hideDelay`: `10` replaced to `0`
- `appendTo`: `false` replaced to `"body"`

Offcanvas:
- `transitionTime`: `500` replaced to `0`
- `forceTo`: `top` replaced to `null`
- `revealOn`: `reveal-for-large` replaced to `null`
- `revealClass`: `reveal-for` replaced to `reveal-for-`
- `trapFocus`: `false` replaced to `false`

Magelian:
- `animationEasing`: `'ease-in-out'` replaced to `linear`
- `deepLinking`: `true` replaced to `false`
- `barOffset`: `25` replaced to `0`

Equalizer:
- `equalizeOnStack`: `true` replaced to `false`
- `equalizeOn`: `'medium'` replaced to `''`

Dropdown:
- `parentClass`: `'dropdown-parent'` replaced to `null`
- `hoverPane`: `true` replaced to `false`
- `positionClass`: `'top'` replaced by `''`
- `autoFocus`: `true` replaced by `false`

Drilldrow:
- `backButton`: `'<\li><\a>Back<\/a><\/li>'` replaced by `'<li
class="js-drilldown-back"><a tabindex="0">Back</a></li>'
- `backButtonPosition`: `bottom` replaced by `top`
- `wrapper`: `<\div class="is-drilldown"><\/div>` replaced by
`'<div></div>'`
- `scrollTopOffset`: `100` replaced by `0