Update maximum IP packet size

Signed-off-by: Petr Vorel <[email protected]>

doc/fping.pod

@@ -50,7 +50,7 @@ room for the data that B<fping> needs to do its work (sequence number,
 timestamp).  The reported received data size includes the IP header (normally
 20 bytes) and ICMP header (8 bytes), so the minimum total size is 40 bytes.
 Default is 56, as in B<ping>. Maximum is the theoretical maximum IP datagram
-size (64K), though most systems limit this to a smaller, system-dependent
+size (65K), though most systems limit this to a smaller, system-dependent
 number.
 
 =item B<-B>, B<--backoff>=I<N>