[csswg-drafts] Pull Request: [css-nesting] Fix Nesting Conditional Rules example

MatheusAvellar has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== [css-nesting] Fix Nesting Conditional Rules example ==
Current example on [Nesting Conditional Rules](https://www.w3.org/TR/css-nesting-1/#conditionals) (§ 2.3) has an invalid parentless `& { ... }` rule:

```css
/* equivalent to
  .foo { display: grid; }

  @media (orientation: landscape) {
    & {                             <--- what does & represent here?
      grid-auto-flow: column;
    }
  }
*/
```

Updated version repositions it inside `.foo`:

```css
/* equivalent to
	  .foo {
		  display: grid;
	  
		  @media (orientation: landscape) {
			  & {                           <--- & represents .foo
				  grid-auto-flow: column;
			  }
		  }
	  }
*/
```

Great proposal otherwise! Really excited for this one :)

See https://github.com/w3c/csswg-drafts/pull/6562


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