Specify where anchor link is added

Author: NicolaSaunders

docs/scripts/heading-anchors.md

@@ -1,6 +1,6 @@
 # Heading anchors
 
-This script is part of `main.js`/`main.min.js`. To help linking to specific parts of pages, this script automatically creates and appends a visible anchor link to any H2-H6 heading within the `<main>` element, with the following exclusions:
+This script is part of `main.js`/`main.min.js`. To help linking to specific parts of pages, this script automatically creates and appends a visible anchor link to the end of any H2-H6 heading within the `<main>` element, with the following exclusions:
 
 - where the heading is a child of a `<nav>` element
 - where the heading carries the attribute `data-anchor="no"`