pgsql: Clarify the role of checkpoint at the begininng of base backups

Clarify the role of checkpoint at the begininng of base backups

Output a message about checkpoint starting in verbose mode of
pg_basebackup, and make the documentation state more clearly that this
happens.

Author: Michael Banck

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/51e26c9c3d2904b65041fc4a19c72c62508f63d4

Modified Files
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doc/src/sgml/backup.sgml | 3 ++-
doc/src/sgml/ref/pg_basebackup.sgml | 10 +++++++++-
src/bin/pg_basebackup/pg_basebackup.c | 11 +++++++++++
3 files changed, 22 insertions(+), 2 deletions(-)

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