perldelta.pod: added summary of formline changes

Summary paragraph received by email from Dave Mitchell.

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index f963a02..530a490 100644 (file)
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -373,6 +373,14 @@ LATIN SMALL LIGATURE LONG S T,
 and
 LATIN SMALL LIGATURE ST.
 
+=item *
+
+Formats: number of edge cases have been fixed with formats and formline;
+in particular, where the format itself is potentially variable (such as
+with ties and overloading), and where the format and data differ in their
+encoding. In both these cases, it used to possible for the output to be
+corrupted.
+
 =back
 
 =head1 Known Problems