pgsql: doc: Remove line breaks after <title>

doc: Remove line breaks after <title>

This creates unnecessary rendering problem risks, and it's
inconsistent and gets copied around.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ab5b55505ec4bf08a9f93810e1bfada93bc63bb5

Modified Files
--------------
doc/src/sgml/features.sgml | 4 +---
doc/src/sgml/ref/createdb.sgml | 4 +---
doc/src/sgml/ref/initdb.sgml | 4 +---
doc/src/sgml/ref/pg_basebackup.sgml | 4 +---
doc/src/sgml/ref/pg_dump.sgml | 4 +---
doc/src/sgml/ref/pg_receivewal.sgml | 4 +---
doc/src/sgml/ref/pg_verifybackup.sgml | 4 +---
doc/src/sgml/xplang.sgml | 4 +---
8 files changed, 8 insertions(+), 24 deletions(-)