Fixed link to SiteAccess-aware settings (#2693)

(cherry picked from commit d35de90)

Author: mnocon

docs/content_management/file_management/file_url_handling.md

@@ -17,7 +17,7 @@ ibexa:
                 url_prefix: '$var_dir$/$storage_dir$'
 ```
 
-`$var_dir$` and `$storage_dir$` are dynamic, [SiteAccess-aware settings](configuration.md#dynamic-settings-injection), and are replaced by their values in the execution context.
+`$var_dir$` and `$storage_dir$` are dynamic, [SiteAccess-aware settings](siteaccess_aware_configuration.md), and are replaced by their values in the execution context.
 
 ## Serving images with nginx