added John Fleck right to commit in the doc subdir Daniel

* HACKING: added John Fleck right to commit in the doc subdir
Daniel
diff --git a/HACKING b/HACKING
index e9c2a7d..bb5aadd 100644
--- a/HACKING
+++ b/HACKING
@@ -28,6 +28,6 @@
 
 Daniel
 
-P.S.: Bjorn Reese and William Brack get an exception for the send before
-      commit rule
+P.S.: Bjorn Reese, William Brack and Thomas Broyer get an exception for
+      the send before commit rule as well as John Fleck for the doc subdir