Typo fixes

Typo fixes

Fix unneeded "ll" in "canceled", "canceling" and "labeled".  Replace
"and" with "an" in the documentation about unpure-pure containers.

[Pavel Roskin, 2012-02-02 19:14:57]

Too bad I only reviewed the "unpure-pure containers" documentation (issue 2040)
after it was committed.

[pkx166h, 2012-02-02 19:19:48]

On 2012/02/02 19:14:57, Pavel Roskin wrote:
> Too bad I only reviewed the "unpure-pure containers" documentation (issue
2040)
> after it was committed.

Pavel, I'm ok with the itely files, and I can see that the cc and scm files are
in comments only (I assume you are doing some kind of manual checking here), I
don't think we need to put this kind of typo patch on a countdown and we could
push this 'as is' once the checks were made. I'm happy if the devs don't mind
the scm and cc files being touched like this. I cannot speak for the
translations though.

james

[Pavel Roskin, 2012-02-02 19:36:37]

Just let me know which files should be left untouched and I'll submit the patch
without changes to those files.

[Graham Percival, 2012-02-02 21:16:06]

LGTM*, please push immediately.

* or rather: I dislike the US spelling of "canceled" vs. the proper British
spelling "cancelled", however our doc guide is quite clear: we use US spelling. 
As such, the patch Looks Correct To Me, regardless of my personal feelings on
the matter.  :)