DOC: management: add the new wrew stats column

This is the number of failed rewrite warnings, per front/listener/back/server.
diff --git a/doc/management.txt b/doc/management.txt
index a2e8d8f..ef9f865 100644
--- a/doc/management.txt
+++ b/doc/management.txt
@@ -1070,6 +1070,7 @@
  80: intercepted [.FB.]: cum. number of intercepted requests (monitor, stats)
  81: dcon [LF..]: requests denied by "tcp-request connection" rules
  82: dses [LF..]: requests denied by "tcp-request session" rules
+ 83: wrew [LFBS]: cumulative number of failed header rewriting warnings
 
 
 9.2) Typed output format