docs: Expand the list of supported image elements with L1/L2 tables

Signed-off-by: Maria Kustova <maria.k@catit.be>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

docs/image-fuzzer.txt

@@ -125,8 +125,7 @@ If a fuzzer configuration is specified, then it has the next interpretation:
     will be always fuzzed for every test. This case is useful for regression
     testing.
 
-For now only header fields and header extensions are generated.
-
+For now only header fields, header extensions and L1/L2 tables are generated.
 
 Module interfaces
 -----------------