doc: fix incorrect 'literal' tags

Bruce Momjian <bruce@momjian.us>

Commit: ff066481b0485b1a4e414de3abcaae0bda02b1e1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2016-08-23T16:45:36Z
Releases: 10.0
doc:  fix incorrect 'literal' tags

Discussion: dcc4113d-1eda-4f60-d1c5-f50eee160bad@gmail.com

Author: Alexander Law <exclusion@gmail.com>

Backpatch-through: 9.6

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