pgsql: doc: Markup and formatting improvements

doc: Markup and formatting improvements

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/a2760915b3a88f8e1b447dd5343549a1ebbb0f78

Modified Files
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doc/src/sgml/ref/alter_subscription.sgml | 6 +++---
doc/src/sgml/ref/create_subscription.sgml | 7 +++++--
doc/src/sgml/ref/drop_subscription.sgml | 4 ++--
3 files changed, 10 insertions(+), 7 deletions(-)

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