Refer to TLV-TYPE as "number" instead of "code"

refs #2880

Change-Id: Ie3bd9dc4cb5ca4c3f7aafeed37266adba88b82fb
diff --git a/src/delegation-list.hpp b/src/delegation-list.hpp
index 2a367ba..b9eb6a9 100644
--- a/src/delegation-list.hpp
+++ b/src/delegation-list.hpp
@@ -64,7 +64,7 @@
 
   /** \brief encode into wire format
    *  \param encoder either an EncodingBuffer or an EncodingEstimator
-   *  \param type TLV-TYPE code, either Content (for \p Link) or ForwardingHint
+   *  \param type TLV-TYPE number, either Content (for \p Link) or ForwardingHint
    *  \throw std::invalid_argument \p type is invalid
    *  \throw Error there is no Delegation
    */