netlink.7: ffix: Remove unneeded .na / .ad tags

These aren't really needed, and they mess up the HTML pages
at man7.org.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/netlink.7

@@ -187,10 +187,8 @@ T}
 NLM_F_ACK:Request for an acknowledgment on success.
 NLM_F_ECHO:Echo this request.
 .TE
-.ad
 .sp 1
 .\" No right adjustment for text blocks in tables
-.na
 .TS
 tab(:);
 l s
@@ -205,17 +203,17 @@ T}
 .\" FIXME NLM_F_ATOMIC is not used any more?
 NLM_F_ATOMIC:Return an atomic snapshot of the table.
 NLM_F_DUMP:T{
-Convenience macro; equivalent to (NLM_F_ROOT|NLM_F_MATCH).
+Convenience macro; equivalent to
+.br
+(NLM_F_ROOT|NLM_F_MATCH).
 T}
 .TE
-.ad
 .sp 1
 Note that
 .B NLM_F_ATOMIC
 requires the
 .B CAP_NET_ADMIN
 capability or an effective UID of 0.
-.na
 .TS
 tab(:);
 l s
@@ -227,7 +225,6 @@ NLM_F_EXCL:Don't replace if the object already exists.
 NLM_F_CREATE:Create object if it doesn't already exist.
 NLM_F_APPEND:Add to the end of the object list.
 .TE
-.ad
 .sp 1
 .I nlmsg_seq
 and