pgsql: Improve function header comment for create_singleton_array().

Improve function header comment for create_singleton_array().

Mentioning the caller is neither future-proof nor an adequate substitute
for giving an API specification. Per gripe from Neha Khatri, though
I changed the patch around some.

Discussion: /messages/by-id/CAFO0U+_fS5SRhzq6uPG+4fbERhoA9N2+nPrtvaC9mmeWivxbsA@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/54affb41e79cf4bec00bb5e00eb12a1715b9e278

Modified Files
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src/backend/utils/adt/array_userfuncs.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

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