[Libguestfs] [PATCH] availability: Clarify and fix documentation.

[Richard W.M. Jones]

Sorry, I meant to add a comment at the top of this patch.

There's some question about whether this call should be called
'guestfs_available' or something else.  Suggestions included (from me)
'guestfs_fail_if_unavailable'.

I *didn't* make that change here, but if someone comes up with a good,
short name, then there's still time to change it before we release a
tarball and the ABI becomes fixed.

Rich.

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