Partial Fix gh-869 Сonfusing wording in box.backup page

Fixed backup.start() use description in disaster recovery.
Note the ref-link to box.backup.stop() is the same as the start().

Author: Vladimir I

doc/1.10/book/admin/disaster_recovery.rst

@@ -113,13 +113,12 @@ The following steps are applicable only to data in memtx storage engine.
 Your actions:
 
 1. Put all nodes in :ref:`read-only mode <cfg_basic-read_only>` and disable
-   checkpointing with :ref:`box.backup.start() <admin-backups-backup_start>`.
-   Disabling the checkpointing is
-   necessary to prevent the Tarantool garbage collector from removing files
-   made with older checkpoints.
+   deletion of expired checkpoints with :ref:`box.backup.start() <admin-backups-backup_start>`.
+   This will prevent the Tarantool garbage collector from removing files
+   made with older checkpoints until :ref:`box.backup.stop() <admin-backups-backup_start>` called.
 
-2. Get the latest valid :ref:`.snap file <internals-snapshot>` and use ``tarantoolctl cat`` command to
-   calculate at which lsn the data loss occurred.
+2. Get the latest valid :ref:`.snap file <internals-snapshot>` and
+   use ``tarantoolctl cat`` command to calculate at which lsn the data loss occurred.
 
 3. Start a new instance (instance#1) and use ``tarantoolctl play`` command to
    play to it the contents of .snap/.xlog files up to the calculated lsn.

locale/ru/LC_MESSAGES/doc.po

@@ -1105,17 +1105,16 @@ msgstr ""
 
 #: ../doc/1.10/book/admin/disaster_recovery.rst:149
 msgid ""
-"Put all nodes in :ref:`read-only mode <cfg_basic-read_only>` and disable "
-"checkpointing with :ref:`box.backup.start() <admin-backups-"
-"backup_start>`. Disabling the checkpointing is necessary to prevent the "
-"Tarantool garbage collector from removing files made with older "
-"checkpoints."
+"Put all nodes in :ref:`read-only mode <cfg_basic-read_only>` and disable"
+"deletion of expired checkpoints with :ref:`box.backup.start() <admin-backups-backup_start>`."
+"This will prevent the Tarantool garbage collector from removing files"
+"made with older checkpoints until :ref:`box.backup.stop() <admin-backups-backup_start>`."
 msgstr ""
 "Переключите все узлы в :ref:`режим только для чтения <cfg_basic-"
 "read_only>` и отключите командой :ref:`box.backup.start() <admin-backups-"
-"backup_start>` создание контрольных точек. Последнее действие необходимо,"
+"backup_start>` удаление устаревших контрольных точек. Последнее действие необходимо,"
 " чтобы сборщик мусора автоматически не удалил более старые контрольные "
-"точки."
+"точки до тех пор, пока не будет вызвана команда :ref:`box.backup.stop() <admin-backups-backup_start>`."
 
 #: ../doc/1.10/book/admin/disaster_recovery.rst:155
 msgid ""