dissect: no longer dissect Content element by default

Use the new -c/--content option to enable it

Change-Id: Id5692b53a0921918bb029ad653b9f5504ab5e4ab
diff --git a/tools/dissect/README.md b/tools/dissect/README.md
index b0da01a..70d2458 100644
--- a/tools/dissect/README.md
+++ b/tools/dissect/README.md
@@ -1,13 +1,14 @@
 # ndn-dissect
 
 **ndn-dissect** is an NDN packet format inspector.
-It reads zero or more NDN packets from either an input file or the standard input,
-and displays the Type-Length-Value (TLV) structure of those packets on the standard output.
+It reads zero or more NDN packets from either an input file or the standard
+input, and displays the Type-Length-Value (TLV) structure of those packets
+on the standard output.
 
 Usage example:
 
-1. start NFD on local machine
-2. execute `echo 'HELLO WORLD' | ndnpoke ndn:/localhost/demo/hello`
-3. on another console, execute `ndnpeek ndn:/localhost/demo/hello | ndn-dissect`
+1. start NFD on the local machine
+2. run `echo 'HELLO WORLD' | ndnpoke /localhost/demo/hello`
+3. on another console, run `ndnpeek /localhost/demo/hello | ndn-dissect`
 
 For more information, consult the manpage.