Re: [w3c/screen-orientation] Where are terms 'primary' and 'secondary' defined within spec? (#113)

I see. What about adding some description like the following?

```html
The term <dfn>primary</dfn> represents the orientation of the screen when the
device is held in its natural orientation, or turned by 90° clockwise from its
natural orientation. The term <dfn>secondary</dfn> represents the orientation of
the screen when the device is held 180° from its normal position, or turned by
90° counterclockwise from its natural orientation.

<div class="figure" id="primary-secondary-example">
    <table>
      <tr>
        <td>
          <img alt="'portrait-primary' when the device is held in its natural orientation"
            src="images/portrait-primary.svg">

        <td>
          <img alt="'portrait-primary' when the device is turned by 90° clockwise from its natural orientation"
            src="images/portrait-primary-2.svg">

        <td>
          <img alt="'portrait-secondary' when the device is turned by 180° from its natural orientation"
              src="images/portrait-secondary.svg">

        <td>
          <img alt="'portrait-secondary' when the device is turned by 90° counterclockwise from its natural orientation"
              src="images/portrait-secondary-2.svg">

      <tr>
        <td>`portrait-primary`
        <td>`portrait-primary`
        <td>`portrait-secondary`
        <td>`portrait-secondary`
    </table>
    <p class="caption">Example of the `portrait-primary` and `portrait-secondary` orientation types
</div>
```

(The images are in https://github.com/xfq/testing/tree/master/screen-orientation/images currently.)

Note that I didn't include the `landscape-*` counterparts in the example. IMHO these four images have already explained the basic idea. WDYT, @mounirlamouri?

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