doc:  clarify CREATE TABLE AS ... IF NOT EXISTS

Mention that the table is not modified if it already exists.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 10

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/7d66ccee99d57055a2ef42aa14b60ff6bdae5f1c

Modified Files
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doc/src/sgml/ref/create_table_as.sgml | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

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