interest: define ForwardingHint

ForwardingHint replaces Link and SelectedDelegation.

refs #4054

Change-Id: I958bf93a625f764b58736a44781eb2038670d8c9
diff --git a/types.rst b/types.rst
index 4ed52f4..a63926f 100644
--- a/types.rst
+++ b/types.rst
@@ -29,6 +29,8 @@
 +---------------------------------------------+-------------------+----------------+
 | InterestLifetime                            | 12                | 0x0c           |
 +---------------------------------------------+-------------------+----------------+
+| ForwardingHint                              | 30                | 0x1e           |
++---------------------------------------------+-------------------+----------------+
 |                   **Interest/Selectors**                                         |
 +---------------------------------------------+-------------------+----------------+
 | MinSuffixComponents                         | 13                | 0x0d           |
@@ -80,7 +82,7 @@
 +----------------+-----------------------------------------------------------+
 | Values         | Designation                                               |
 +================+===========================================================+
-| 0, 2-4, 30-79  | Reserved for future assignments (1-byte encoding)         |
+| 0, 2-4, 31-79  | Reserved for future assignments (1-byte encoding)         |
 +----------------+-----------------------------------------------------------+
 | 11             | Reserved, formerly `Scope`                                |
 +----------------+-----------------------------------------------------------+