Add missing @raise YARD tag for Mixins::HasPayload#payload=.

lib/ronin/exploits/mixins/has_payload.rb

@@ -111,6 +111,9 @@ def initialize(payload: nil, **kwargs)
         # @return [Ronin::Payloads::Payload, String, nil]
         #   The new payload of the exploit.
         #
+        # @raise [IncompatiblePayload]
+        #   An incompatible payload object was given to the exploit.
+        #
         def payload=(new_payload)
           if new_payload.kind_of?(Payloads::Payload)
             unless new_payload.kind_of?(self.class.payload_class)