ensure, not insure

Hi,

While looking at GUC messages today I noticed the following:

gettext_noop("The server will use the fsync() system call in several
places to make "
  "sure that updates are physically written to disk. This insures "
  "that a database cluster will recover to a consistent state after "
  "an operating system or hardware crash.")

~

I believe the word should have been "ensures"; not "insures".

In passing I found/fixed a bunch of similar misuses in comments.

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Kind Regards,
Peter Smith.
Fujitsu Australia.