collectd.pod: Correct the information about the different modes.

There are _four_ modes now. Also, be more clear about when and why the `Client'
mode is the default mode.

diff --git a/src/collectd.pod b/src/collectd.pod
index fcad460..26185ee 100644 (file)
--- a/src/collectd.pod
+++ b/src/collectd.pod
@@ -124,19 +124,19 @@ Output usage information and exit.
 
 =head1 MODES
 
-collectd can operate in three different operating modes. The modes are
-described below.
+collectd can operate in four different operating modes. The modes are described
+below.
 
 The simplest mode is the so called B<local mode>. Data is collected locally and
 written in RRD files that reside in I<DataDir>. This is the default mode when
 collectd is linked against C<librrd>.
 
-The other modes, B<client mode> and B<server mode>, are used to send data over
-a network and receive it again.
+The modes B<client mode> and B<server mode> are used to send data over a
+network and receive it again.
 
 In B<client mode> the daemon collects the data locally and sends its results
-to one or more network addresses. No RRD files are written in this case. This
-is the only mode available if collectd is not linked against C<librrd>.
+to one or more network addresses. No RRD files are written locally in this
+case. If collectd is not linked against C<librrd> this is the default mode.
 
 If started in B<server mode> the daemon will listen on one or more interfaces
 and write the data it receives to RRD files. No data is collected locally.