[5008] Minor correction to logging documentation

doc/guide/logging.xml

@@ -74,10 +74,10 @@
         configuration for zero or more loggers (including loggers used by the
         proprietary hooks libraries). If there are no loggers specified, the
         code will use default values: these cause Kea to log messages of INFO
-        severity or greater to standard output. There's also a small
-	time window after Kea is started, but has not yet read its
-	configuration. Logging in this short period can be controlled
-	using environment variables. For details, see <xref linkend="logging-during-startup"></xref>.
+        severity or greater to standard output. There is also a small
+        time window after Kea has been started, but has not yet read its
+        configuration. Logging in this short period can be controlled
+        using environment variables. For details, see <xref linkend="logging-during-startup"></xref>.
       </para>
 
       <para>