strace.1.in: clarify -F option behaviour

* strace.1.in <.TP \-F>: Extend deprecation warning.  Describe behaviour
of multiple instances of -F and interoperability of -F and -f.

diff --git a/strace.1.in b/strace.1.in
index 61293cfa6d4dfc36e8f9d80c8438342bf720f63a..6f1b642118e969de71de96c20cdc3dd7854d6618 100644 (file)
--- a/strace.1.in
+++ b/strace.1.in
@@ -787,8 +787,15 @@ Show some debugging output of
 itself on the standard error.
 .TP
 .B \-F
-This option is now obsolete and it has the same functionality as
-.BR \-f .
+This option is deprecated.  It is retained for backward compatibility only
+and may be removed in future releases.
+Usage of multiple instances of
+.B \-F
+option is still equivalent to a single
+.BR \-f ,
+and it is ignored at all if used along with one or more instances of
+.B \-f
+option.
 .TP
 .B \-h
 Print the help summary.