[docs] [issue25523] Correct "a" article to "an" article

[Roundup Robot]

Roundup Robot added the comment:

New changeset 75df8b0a2cd1 by Serhiy Storchaka in branch '3.4':
Issue #25523: Further a-to-an corrections.
https://hg.python.org/cpython/rev/75df8b0a2cd1

New changeset 68edc7baeef7 by Serhiy Storchaka in branch '3.5':
Issue #25523: Merge a-to-an corrections from 3.4.
https://hg.python.org/cpython/rev/68edc7baeef7

New changeset a0d0f968b020 by Serhiy Storchaka in branch '3.5':
Issue #25523: Further a-to-an corrections new in 3.5.
https://hg.python.org/cpython/rev/a0d0f968b020

New changeset 72cca30f4707 by Serhiy Storchaka in branch 'default':
Issue #25523: Merge a-to-an corrections from 3.5.
https://hg.python.org/cpython/rev/72cca30f4707

New changeset e8f3c011e2b4 by Serhiy Storchaka in branch '2.7':
Issue #25523: Backported a-to-an corrections.
https://hg.python.org/cpython/rev/e8f3c011e2b4

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<http://bugs.python.org/issue25523>
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