doc: Fix naming of SELinux

Michael Paquier <michael@paquier.xyz>

Commit: 8d55879f089563cf1d62266d921c0a00d2b9fff8
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-01-10T00:37:38Z
Releases: 9.5.21
doc: Fix naming of SELinux

Reported-by: Tham Nguyen
Discussion: https://postgr.es/m/157851402876.29175.12977878383183540468@wrigleys.postgresql.org
Backpatch-through: 9.4

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