ip: Few typo and grammar errors fixes for ip(8) manpage

man/man8/ip.8

@@ -1289,7 +1289,7 @@ can also be
 .BI nud " NUD_STATE"
 the state of the neighbour entry.
 .B nud
-is an abbreviation for 'Neigh bour Unreachability Detection'.
+is an abbreviation for 'Neighbour Unreachability Detection'.
 The state can take one of the following values:
 
 .in +8
@@ -1614,7 +1614,7 @@ peers are allowed to send to us.
 .BI rtt " TIME"
 the initial RTT ('Round Trip Time') estimate. If no suffix is
 specified the units are raw values passed directly to the
-routing code to maintain compatability with previous releases.
+routing code to maintain compatibility with previous releases.
 Otherwise if a suffix of s, sec or secs is used to specify
 seconds; ms, msec or msecs to specify milliseconds; us, usec
 or usecs to specify microseconds; ns, nsec or nsecs to specify
@@ -2484,7 +2484,7 @@ contains one or more algorithms
 .I ALGO
 which depend on the type of algorithm set by
 .IR ALGO_TYPE "."
-It can be used these algoritms
+Valid algorithms are:
 .BR enc ", " auth " or " comp "."
 
 .SS ip xfrm policy add - add a new policy