Bolt 1: Add where tuXX fields may be used.

As truncated integers are not limited to TLV records with single
values (e.g. onion-routing payload type 8 - payment data) we want
to further clarify where the tuXX fields can be used.

Signed-off-by: Peter Neuroth <[email protected]>

Author: nepet

01-messaging.md

@@ -224,7 +224,7 @@ Various fundamental types are referred to in the message specifications:
 * `u32`: a 4 byte unsigned integer
 * `u64`: an 8 byte unsigned integer
 
-Inside TLV records which contain a single value, leading zeros in
+For the final value in TLV records, truncated integers may be used. leading zeros in
 truncated integers MUST be omitted:
 
 * `tu16`: a 0 to 2 byte truncated unsigned integer