pgsql: Add missing tags in application doc

Add missing <application> tags in application doc <refentrytitle>s

Most of them already have this, but some were missing.

Author: Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Discussion: https://www.postgresql.org/message-id/flat/87o8pco34z.fsf%40wibble.ilmari.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/72a16cb3ee3017ccd8e4d58ea3c0c7bceec8b702

Modified Files
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doc/src/sgml/ref/initdb.sgml          | 2 +-
doc/src/sgml/ref/pg_basebackup.sgml   | 2 +-
doc/src/sgml/ref/pg_config-ref.sgml   | 2 +-
doc/src/sgml/ref/pg_dump.sgml         | 2 +-
doc/src/sgml/ref/pg_receivewal.sgml   | 2 +-
doc/src/sgml/ref/pg_restore.sgml      | 2 +-
doc/src/sgml/ref/pg_verifybackup.sgml | 2 +-
7 files changed, 7 insertions(+), 7 deletions(-)