[Rspamd] doc and xls are blocked

data/conf/rspamd/local.d/mime_types.conf

@@ -4,6 +4,8 @@ bad_extensions = {
   scr = 20,
   lnk = 20,
   exe = 20,
+  doc = 20,
+  xls = 20,
   msi = 1,
   msp = 1,
   msu = 1,