Revert "simplify documentation"

This reverts commit 7693af147926d0eb7369a43070d114b6bd79dc70.

Now it is wrong:

After reading

    https://www.naemon.org/documentation/usersguide/pluginapi.html#plugin_output_spec

the old wording makes more sense.

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/developer-guidelines.sgml b/doc/developer-guidelines.sgml
index 5f480c5f..6f31f365 100644
--- a/doc/developer-guidelines.sgml
+++ b/doc/developer-guidelines.sgml
@@ -324,8 +324,8 @@
                 </section>
 
                 <section><title>Performance data</title>
-                <para>Nagios 3 and newer will concatenate the parts following a "|" in  
-                each line of output by the plugin into a string it
+                <para>Nagios 3 and newer will concatenate the parts following a "|" in a) the first
+                line output by the plugin, and b) in the second to last line, into a string it
                 passes to whatever performance data processing it has configured. (Note that it
                 currently does not insert additional whitespace between both, so the plugin needs
                 to provide some to prevent the last pair of a) and the first of b) getting run