message: doc: Remove upgrade note in release notes from EOL versions
diff: @@ -24,14 +24,9 @@ shut down (which might take a few minutes for older versions), then run the
  installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
  or `bitcoind`/`bitcoin-qt` (on Linux).
  -The first time you run version 0.15.0, your chainstate database will be converted to a
  -new format, which will take anywhere from a few minutes to half an hour,
  -depending on the speed of your machine.
  -
  -Note that the block database format also changed in version 0.8.0 and there is no
  -automatic upgrade code from before version 0.8 to version 0.15.0. Upgrading
  -directly from 0.7.x and earlier without redownloading the blockchain is not supported.
  -However, as usual, old wallet versions are still supported.
  +Upgrading directly from a version of Bitcoin Core that has reached its EOL is
  +possible, but might take some time if the datadir needs to be migrated. Old
  +wallet versions of Bitcoin Core are generally supported.
  Downgrading warning
  -------------------
  