message: [addrman] Improve serialization comments
  Thanks to Vasil Dimov for these suggestions
diff: @@ -335,23 +335,20 @@ public:
  * * nNew
  * * nTried
  * * number of "new" buckets XOR 2**30
  - * * all nNew addrinfos in vvNew
  - * * all nTried addrinfos in vvTried
  - * * for each bucket:
  + * * all new addresses (total count: nNew)
  + * * all tried addresses (total count: nTried)
  + * * for each new bucket:
  * * number of elements
  - * * for each element: index
  + * * for each element: index in the serialized "all new addresses"
  * * asmap checksum
  *
  * 2**30 is xorred with the number of buckets to make addrman deserializer v0 detect it
  * as incompatible. This is necessary because it did not check the version number on
  * deserialization.
  *
  - * Notice that vvTried, mapAddr and vVector are never encoded explicitly;
  + * vvNew, vvTried, mapInfo, mapAddr and vRandom are never encoded explicitly;
  * they are instead reconstructed from the other information.
  *
  - * vvNew is serialized, but only used if ADDRMAN_NEW_BUCKET_COUNT and the asmap checksum
  - * didn't change, otherwise it is reconstructed as well.
  - *
  * This format is more complex, but significantly smaller (at most 1.5 MiB), and supports
  * changes to the ADDRMAN_ parameters without breaking the on-disk structure.
  *
  