[doc] @nest with several rules/selectors

[brillout]

From reading the doc I was expecting following to work

div {
  @nest .c1 &,
  @nest .c2 & {
    color: red;
  }
}

but the correct usage is

div {
  @nest
  .c1 &,
  .c2 & {
    color: red;
  }
}

A note or example about that would have saved me 30mn.

Thanks for postcss-nesting btw, I really like it.

[jonathantneal]

The at-rule nesting in the first example demonstrates this. Still, bummed you had to lose time on it.