DOCSP-16465 add license warning

Author: andf-mongodb

source/reference/mongodb-wire-protocol.txt

@@ -12,6 +12,14 @@ MongoDB Wire Protocol
    :depth: 1
    :class: singlecol
 
+.. note::
+
+   This MongoDB Wire Protocol Specification is licensed under a
+   `Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License
+   <https://creativecommons.org/licenses/by-nc-sa/3.0/us/>`__. You may
+   not use or adapt this material for any commercial purpose, such as
+   to create a commercial database or database-as-a-service offering.
+
 Introduction
 ------------