Fixed Varnish link

Author: mnocon

docs/update_and_migration/from_4.6/update_from_4.6.md

@@ -193,7 +193,7 @@ Fastly users are not affected.
 
 === "Varnish 6"
 
-    Update your Varnish VCL file to align it with the [`vendor/ibexa/http-cache/docs/varnish/vcl/varnish5.vcl`](https://github.com/ibexa/http-cache/blob/4.6/docs/varnish/vcl/varnish6.vcl) file.
+    Update your Varnish VCL file to align it with the [`vendor/ibexa/http-cache/docs/varnish/vcl/varnish6.vcl`](https://github.com/ibexa/http-cache/blob/4.6/docs/varnish/vcl/varnish6.vcl) file.
 
 === "Varnish 7"