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

Serhiy Storchaka added the comment: Here is a patch with additional changes. ---------- resolution: fixed -> stage: resolved -> patch review status: closed -> open Added file: http://bugs.python.org/file40925/a-an_2.patch _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue25523> _______________________________________