docs: Consistently use <optional> to indicate optional parameters

Some functions were using square brackets instead, replace them all
with <optional>.

Author: Dagfinn Ilmari MannsÃ¥ker <[email protected]>
Reviewed-by: jian he <[email protected]>
Discussion: 
https://www.postgresql.org/message-id/flat/cacjufxffubsph5uusszbl4sitbupuw%[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0d829703363ba70844ff545ccc73befb2a7fed2e

Modified Files
--------------
doc/src/sgml/func.sgml | 48 ++++++++++++++++++++++++------------------------
1 file changed, 24 insertions(+), 24 deletions(-)

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