doc: history info no longer merges transactions

We have agreed that the new dnf5 behavior of simply listing all selected
transactions is more expected.

Originally the merging was introduced 15 years ago in commits
rpm-software-management/dnf@6e94950
and
rpm-software-management/dnf@b058142

doc/changes_from_dnf4.7.rst

@@ -209,6 +209,7 @@ Changes to individual commands
   * ``store`` subcommand's ``--output`` option now accepts a directory path instead of a file. The default is ``./transaction``.
   * ``replay`` subcommand was moved to a standalone ``replay`` command, that now accepts a path to a directory instead of a file path.
     The directory can be created with ``--store`` option and in addition to the JSON transaction, it can contain packages, group and environments used in the transaction.
+  * ``info`` subcommand now prints a separate section for each selected transaction. It no longer merges all selected transactions into a single transaction section.
 
 ``info``
   * Dropped ``--all`` option since this behavior is the default one.