Added docs detailing containing latest protocol changes.

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diff --git a/docs/updates/Spam-Prevention.md b/docs/updates/Spam-Prevention.md
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+ 
+Situation 1:
+Someone randomly goes around the DHT sending friend requests to everyone.
+
+Prevented by:
+Every friend address: 
+[client_id (32 bytes)][nospam number (4 bytes)][checksum (2 bytes)] 
+contains a number (nospam).
+
+The nospam in every friend request to that friend must be that number.
+
+If not it is rejected.