message: Move CHANGELOG links to separate lines.
diff: * Disable copying of various classes to prevent incorrect use at compile time.
  PR [#2468](https://github.com/realm/realm-core/pull/2468).
  * History type enumeration value `Replication::hist_Sync` renamed to
  - `Replication::hist_SyncClient`. PR [#2482](https://github.com/realm/realm-core/pull/2482).
  + `Replication::hist_SyncClient`.
  + PR [#2482](https://github.com/realm/realm-core/pull/2482).
  * Bumps file format version from 6 to 7 due to addition of a 10th element into
  `Group::m_top`. The new element is the history schema version, which is
  crucial for managing the schema upgrade process of sync-type histories in a
  way that is independent of core's Realm file format. The bump is necessary due
  to lack of forwards compatibility. The changes are backwards compatible, and
  - automatic upgrade is implemented. PR [#2481](https://github.com/realm/realm-core/pull/2481).
  + automatic upgrade is implemented.
  + PR [#2481](https://github.com/realm/realm-core/pull/2481).
  * New pure virtual methods `get_history_schema_version()`,
  `is_upgradable_history_schema()`, and `upgrade_history_schema()` in
  - `Replication` interface. PR [#2481](https://github.com/realm/realm-core/pull/2481).
  + `Replication` interface.
  + PR [#2481](https://github.com/realm/realm-core/pull/2481).
  ### Enhancements
  PR [#2504](https://github.com/realm/realm-core/pull/2504).
  * New history type enumeration value `Replication::hist_SyncServer`. This allows
  for the sync server to start using the same kind of in-Realm history scheme as
  - is currently used by clients. PR [2482](https://github.com/realm/realm-core/pull/2482).
  + is currently used by clients.
  + PR [#2482](https://github.com/realm/realm-core/pull/2482).
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