pgsql: doc: Mention pg_stat_wal_receiver in streaming replication docs

doc: Mention pg_stat_wal_receiver in streaming replication docs

Also make the link to pg_stat_replication more precise.

Author: Michael Paquier <michael.paquier@gmail.com>
Reviewed-by: Jeff Janes <jeff.janes@gmail.com>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/ec7ce54204147ccf1a55aaba526ac4b39071f712

Modified Files
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doc/src/sgml/high-availability.sgml | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

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