pgsql: Fix broken markup, and copy-edit a bit.

Fix broken markup, and copy-edit a bit.

Fix docs build failure introduced by commit 6fcd88511f8e69e3.
I failed to resist the temptation to rearrange the description of
pg_create_physical_replication_slot(), too.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/750fc78bca7c5cff7459d02315cf7fed4f4ce3a9

Modified Files
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doc/src/sgml/func.sgml | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)

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