pgsql: Now that we have non-Latin1 SGML detection, restore Latin1 chars

Now that we have non-Latin1 SGML detection, restore Latin1 chars

This reverts the change in commit 641a5b7a144 that converted them to
HTML entities.

Reported-by: Peter Eisentraut

Discussion: https://postgr.es/m/Z05ssoVheWI-rqax@momjian.us

Backpatch-through: master

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/8b318a168a5830770722c501d7db0607649b3c33

Modified Files
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doc/src/sgml/charset.sgml       | 10 +++++-----
doc/src/sgml/stylesheet-man.xsl | 12 ++++++------
2 files changed, 11 insertions(+), 11 deletions(-)