Copy-edit the docs changes of OWNER TO CURRENT/SESSION_USER additions.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: ebe8bcd94e7191025e0309718284983891a89064
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-07-10T11:48:27Z
Releases: 9.5.0
Copy-edit the docs changes of OWNER TO CURRENT/SESSION_USER additions.

Commit 31eae602 added new syntax to many DDL commands to use CURRENT_USER
or SESSION_USER instead of role name in ALTER ... OWNER TO, but because
of a misplaced '{', the syntax in the docs implied that the syntax was
"ALTER ... CURRENT_USER", instead of "ALTER ... OWNER TO CURRENT_USER".
Fix that, and also the funny indentation in some of the modified syntax
blurps.

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