logger_level change

doc/user/configuration-reference.xml

@@ -698,9 +698,9 @@ tarantool_box: primary@sessions pri: 33013 sec: 33014 adm: 33015</programlisting
           <entry>4</entry>
           <entry>no</entry>
           <entry><emphasis role="strong">yes</emphasis></entry>
-          <entry>How verbose the logging is. There are 5 log
-            verbosity classes: 1 -- ERROR, 2 -- CRITICAL, 3 --
-            WARNING, 4 -- INFO, 5 -- DEBUG. By setting log_level,
+          <entry>How verbose the logging is. There are six log
+            verbosity classes: 1 -- SYSERROR, 2 -- ERROR, 3 -- CRITICAL, 4 --
+            WARNING, 5 -- INFO, 6 -- DEBUG. By setting log_level,
             one can enable logging of all classes below or equal
             to the given level. Tarantool prints its logs to the
             standard error stream by default, but this can be
@@ -748,7 +748,7 @@ tarantool_box: primary@sessions pri: 33013 sec: 33014 adm: 33015</programlisting
           <entry><emphasis role="strong">yes</emphasis></entry>
           <entry>If processing a request takes longer than the
           given value (in seconds), warn about it in the log.
-          Has effect only if log_level is less than or equal to 3
+          Has effect only if log_level is less than or equal to 4
           (WARNING).</entry>
         </row>