add example of warning categorization to perldiag

diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index ed88545..80b39a8 100644 (file)
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -20,7 +20,7 @@ The majority of messages from the first three classifications above
 
 If a message can be controlled by the C<warnings> pragma, its warning
 category is included with the classification letter in the description
-below.
+below.  E.g. C<(W closed)> means a warning in the C<closed> category.
 
 Optional warnings are enabled by using the C<warnings> pragma or the B<-w>
 and B<-W> switches.  Warnings may be captured by setting C<$SIG{__WARN__}>