pgsql: doc: Reorder table for Object DDL Functions

doc: Reorder table for Object DDL Functions

While on it, let's add links pointing to the set of SQL commands
generated by these functions. The descriptions of the functions are
exactly the same, just moved around.

Author: Peter Smith <smithpb2250@gmail.com>
Reviewed-by: Ian Lawrence Barwick <barwick@gmail.com>
Discussion: /messages/by-id/CAHut+Pun9Z8qZFJTa9fLgdhM=Cip9d-cnx2YXDW6eFrSwbQj1g@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/b7e4e3e7fa73458ecca5cd10f341743fd12a4faa

Modified Files
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doc/src/sgml/func/func-info.sgml | 81 +++++++++++++++++++++-------------------
1 file changed, 42 insertions(+), 39 deletions(-)