pgsql: doc: Fix man page whitespace issues

doc: Fix man page whitespace issues

Whitespace between tags is significant, and in some cases it creates
extra vertical space in man pages. The fix is either to remove some
newlines or in some cases to reword slightly to avoid the awkward
markup layout.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a02b8bdd9878ae1d1ead87aabb673d60432500ea

Modified Files
--------------
doc/src/sgml/ref/alter_collation.sgml | 3 +--
doc/src/sgml/ref/alter_subscription.sgml | 3 +--
doc/src/sgml/ref/alter_type.sgml | 3 +--
doc/src/sgml/ref/alter_view.sgml | 3 +--
doc/src/sgml/ref/create_extension.sgml | 3 +--
doc/src/sgml/ref/create_language.sgml | 3 +--
doc/src/sgml/ref/create_publication.sgml | 5 +----
doc/src/sgml/ref/create_subscription.sgml | 3 +--
doc/src/sgml/ref/create_view.sgml | 3 +--
doc/src/sgml/ref/drop_function.sgml | 3 +--
doc/src/sgml/ref/drop_procedure.sgml | 3 +--
doc/src/sgml/ref/drop_routine.sgml | 3 +--
doc/src/sgml/ref/pg_basebackup.sgml | 6 ++----
doc/src/sgml/ref/pg_verifybackup.sgml | 3 +--
doc/src/sgml/ref/pgbench.sgml | 6 ++----
doc/src/sgml/ref/pgupgrade.sgml | 6 ++----
doc/src/sgml/ref/psql-ref.sgml | 8 ++------
doc/src/sgml/ref/select.sgml | 5 ++---
doc/src/sgml/spi.sgml | 2 +-
19 files changed, 24 insertions(+), 50 deletions(-)