pgsql: doc: Apply more consistently markup for OpenSSL

doc: Apply more consistently <productname> markup for OpenSSL

OpenSSL was quoted in inconsistent ways in many places of the docs,
sometimes with <application>, <productname> or just nothing.

Author: Daniel Gustafsson
Discussion: https://postgr.es/m/DA91E5F0-5F9D-41A7-A7A6-B91CDE0F1D63@yesql.se

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/089da3c4778fdc1931f721a265caa0c6fca38584

Modified Files
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doc/src/sgml/config.sgml       | 16 +++++++------
doc/src/sgml/installation.sgml |  2 +-
doc/src/sgml/libpq.sgml        | 51 ++++++++++++++++++++++++------------------
doc/src/sgml/pgcrypto.sgml     | 14 +++++++-----
doc/src/sgml/sslinfo.sgml      |  4 ++--
5 files changed, 49 insertions(+), 38 deletions(-)