Typo in id in URL (#45232)

The id in the url misses the hyphen, and doesn't link to the id correctly.

docs/explanations/faq.md

@@ -28,7 +28,7 @@ What follows is a set of questions that have come up from the last few years of
 
 ### The Development Experience
 - [How do I make my own block?](#how-do-i-make-my-own-block)
-- [Does Gutenberg involve editing posts/pages in the front-end?](#does-gutenberg-involve-editing-postspages-in-the-front-end)
+- [Does Gutenberg involve editing posts/pages in the front-end?](#does-gutenberg-involve-editing-posts-pages-in-the-front-end)
 - [Given Gutenberg is built in JavaScript, how do old meta boxes (PHP) work?](#given-gutenberg-is-built-in-javascript-how-do-old-meta-boxes-php-work)
 - [How can plugins extend the Gutenberg UI?](#how-can-plugins-extend-the-gutenberg-ui)
 - [Are Custom Post Types still supported?](#are-custom-post-types-still-supported)