ip.7: Mnor fixes

Reported-by: Benjamin Poirier <benjamin.poirier@gmail.com>
Reported-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/ip.7

@@ -318,7 +318,6 @@ For
 sockets,
 .B IP_PMTUDISC_DO
 forces the don't-fragment flag to be set on all outgoing packets.
-The don't-fragment flag is set on all outgoing datagrams.
 It is the user's responsibility to packetize the data
 in MTU-sized chunks and to do the retransmits if necessary.
 The kernel will reject (with
@@ -340,7 +339,7 @@ file.
 tab(:);
 c l
 l l.
-Path MTU discovery flags:Meaning
+Path MTU discovery value:Meaning
 IP_PMTUDISC_WANT:Use per-route settings.
 IP_PMTUDISC_DONT:Never do Path MTU Discovery.
 IP_PMTUDISC_DO:Always do Path MTU Discovery.