doc: remove unnecessary blank before command option text

Bruce Momjian <bruce@momjian.us>

Commit: f3f033a28426796653cadbc576fe83ec3ab60673
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-12-03T16:33:24Z
Releases: 12.6
doc: remove unnecessary blank before command option text

Backpatch-through: 11

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