Update lorgotate config example (#4043)

Per tarantool/tt@a909b1a

Author: p7nov

doc/book/admin/logs.rst

@@ -51,16 +51,17 @@ A Tarantool log rotation configuration for ``logrotate`` can look like this:
 
 .. code-block:: text
 
-    /var/log/tarantool/*.log {
+    # /var/log/tarantool/<env>/<app>/<instance>/*.log
+    /var/log/tarantool/*/*/*/*.log {
         daily
         size 512k
         missingok
         rotate 10
         compress
         delaycompress
-        create 0640 tarantool adm
+        sharedscripts # Run tt logrotate only once after all logs are rotated.
         postrotate
-            tt -c <tt_config_file> logrotate
+            /usr/bin/tt -S logrotate
         endscript
     }
 
@@ -93,4 +94,4 @@ specify the :ref:`box.cfg.log <cfg_logging-log>` parameter, for example:
     box.cfg{log = 'syslog:identity=tarantool,facility=user'}
 
 In such configurations, log rotation is usually handled by the external program
-used for logging.
+used for logging.