Update sectioning content to fit spec (#31943)

files/en-us/web/html/content_categories/index.md

@@ -122,7 +122,7 @@ A few other elements belong to this category, but only if a specific condition i
 
 ### Sectioning content
 
-Sectioning content, a subset of flow content, creates a [section in the current outline](/en-US/docs/Web/HTML/Element/Heading_Elements) defining the scope of {{HTMLElement("header")}} elements, {{HTMLElement("footer")}} elements, and [heading content](#heading_content).
+Sectioning content, a subset of flow content, creates a [section in the current outline](/en-US/docs/Web/HTML/Element/Heading_Elements) defining the scope of {{HTMLElement("header")}} and {{HTMLElement("footer")}} elements.
 
 Elements belonging to this category are {{HTMLElement("article")}}, {{HTMLElement("aside")}}, {{HTMLElement("nav")}}, and {{HTMLElement("section")}}.