ip: fix man page warnings

Fix usage of ".R" which is not man macro.
diff --git a/man/man8/ip.8 b/man/man8/ip.8
index 49d94f5..36431b6 100644
--- a/man/man8/ip.8
+++ b/man/man8/ip.8
@@ -584,12 +584,10 @@
 .ti -8
 .IR ALGO " :="
 .RB "{ " enc " | " auth " | " comp " } " 
-.IR ALGO-NAME " " ALGO-KEY
-.R "|"
+.IR ALGO-NAME " " ALGO-KEY " |"
 .br
-.B aead
-.IR ALGO-NAME " " ALGO-KEY " " ALGO-ICV-LEN
-.R "|"
+.B  aead
+.IR ALGO-NAME " " ALGO-KEY " " ALGO-ICV-LEN  " |"
 .br
 .B auth-trunc
 .IR ALGO-NAME " " ALGO-KEY " " ALGO-TRUNC-LEN