Document 7f911abe's new functions came in 11.0

Document that the 7f911abe "Add support to libkvm for reading vmcores
from other architectures." added functions appeared first in FreeBSD 11.0.

lib/libkvm/kvm.3

@@ -161,3 +161,12 @@ and
 .Xr sysctl 3 ,
 .Xr kmem 4 ,
 .Xr mem 4
+.Sh HISTORY
+The
+.Fn kvm_native ,
+.Fn kvm_nlist2 ,
+.Fn kvm_open2 ,
+and
+.Fn kvm_read2
+functions first appeared in
+.Fx 11.0 .

lib/libkvm/kvm_nlist.3

@@ -116,3 +116,8 @@ If the kernel symbol table was unreadable, -1 is returned.
 .Xr kvm_openfiles 3 ,
 .Xr kvm_read 3 ,
 .Xr kvm_write 3
+.Sh HISTORY
+The
+.Fn kvm_nlist2
+function first appeared in
+.Fx 11.0 .

lib/libkvm/kvm_open.3

@@ -269,3 +269,8 @@ of the Sun library and the desire to have a backward-compatible library
 for
 .Bx
 left little choice.
+.Sh HISTORY
+The
+.Fn kvm_open2
+function first appeared in
+.Fx 11.0 .

lib/libkvm/kvm_read.3

@@ -104,3 +104,8 @@ Otherwise, -1 is returned.
 .Xr kvm_nlist 3 ,
 .Xr kvm_open 3 ,
 .Xr kvm_openfiles 3
+.Sh HISTORY
+The
+.Fn kvm_read2
+function first appeared in
+.Fx 11.0 .