docs/9.1/static/kernel-resources.html needs updating for NetBSD

Hello

The default number of semaphores sets of NetBSD ist too low for Postgres
(tested on 9.1)

I would suggest replacing the sentence:

In NetBSD 5.0 and later, IPC parameters can be adjusted using sysctl,
for example:

$ sysctl -w kern.ipc.shmmax=16777216

with the following:

The default settings are only suitable for small installations. In
NetBSD 5.0 and later, IPC parameters should be adjusted using sysctl,
for example:

$ sysctl -w kern.ipc.shmmax=16777216
$ sysctl -w kern.ipc.semmni=256
$ sysctl -w kern.ipc.semmns=512

Tuning NetBSD for Postgres is mentionned at
http://wiki.netbsd.org/tutorials/tuning_netbsd_for_performance/

Emmanuel