Fixed a documentation error in protocol.txt

Prior to the documentation told users to pass 0 in as
the first argument to write messages, when they should
be outting in their local-id. It is now corrected.

Change-Id: Ia2c6c84f95383baa5ca471493a29a39e5173b604
Signed-off-by: Derrick Bonafilia <dbonafilia@google.com>
diff --git a/adb/protocol.txt b/adb/protocol.txt
index c9d3c24..333e7e7 100644
--- a/adb/protocol.txt
+++ b/adb/protocol.txt
@@ -133,7 +133,7 @@
 
 
 
---- WRITE(0, remote-id, "data") ----------------------------------------
+--- WRITE(local-id, remote-id, "data") ---------------------------------
 
 The WRITE message sends data to the recipient's stream identified by
 remote-id.  The payload MUST be <= maxdata in length.