Address.h : fix api reference warning

The following parameters of WMEM_COPY_ADDRESS(scope, to, from) are not documented:  parameter 'scope'

Change-Id: Ice1bddb55839f7aa839bdf6dec74211cf7e4d9dc
Reviewed-on: https://code.wireshark.org/review/8227
Reviewed-by: Anders Broman <a.broman58@gmail.com>

epan/address.h

@@ -180,6 +180,7 @@ copy_address_shallow(address *to, const address *from) {
 /** Copy an address, allocating a new buffer for the address data
  *  using wmem-scoped memory.
  *
+ * @param scope [in] The lifetime of the allocated memory, wmem_packet_scope()
  * @param to [in,out] The destination address.
  * @param from [in] The source address.
  */