[css-overflow-3] Typo in example 6

[johannesodland]

https://drafts.csswg.org/css-overflow-3/#example-bf93dfa6

Example 6 in CSS Overflow Module 3 says "truncated to fit within 10 lines"

But then the example is defined as follows:

li {
  line-clamp: 5 "… (continued on next page)";
}

The text should probably say "truncated to fit within 5 lines"?