C comments: "a" <--> "an" corrections

Bruce Momjian <bruce@momjian.us>

Commit: 20b4323bd107920a3c3e60452442e8e2cee302d2
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-03-29T19:18:53Z
Releases: 11.0
C comments:  "a" <--> "an" corrections

Reported-by: Michael Paquier, Abhijit Menon-Sen

Discussion: https://postgr.es/m/20180305045854.GB2266@paquier.xyz

Author: Michael Paquier, Abhijit Menon-Sen, me

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