doc: Fix naming of SELinux

Michael Paquier <michael@paquier.xyz>

Commit: 2e89a1248db51bebd01f41011d439cdf9832eca8
Author: Michael Paquier <michael@paquier.xyz>
Date: 2020-01-10T00:37:16Z
Releases: 12.2
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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