Fix a typo in the filters documentation

Backport of gh-33959
Closes gh-33971

Author: ngocnhan-tran1996

framework-docs/modules/ROOT/pages/web/webmvc/filters.adoc

@@ -26,7 +26,7 @@ available through the `ServletRequest.getParameter{asterisk}()` family of method
 
 
 
-[[forwarded-headers]]
+[[filters-forwarded-headers]]
 == Forwarded Headers
 [.small]#xref:web/webflux/reactive-spring.adoc#webflux-forwarded-headers[See equivalent in the Reactive stack]#