Fix typo: colums -> columns.

Robert Haas <rhaas@postgresql.org>

Commit: a9fd6c321672c14940461ee47c52434bcf2ecdf9
Author: Robert Haas <rhaas@postgresql.org>
Date: 2018-01-31T21:45:52Z
Releases: 10.2
Fix typo: colums -> columns.

Along the way, also fix code indentation.

Alexander Lakhin, reviewed by Michael Paquier

Discussion: http://postgr.es/m/45c44aa7-7cfa-7f3b-83fd-d8300677fdda@gmail.com

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