Further clarify documentation for the initcap function

This is a follow-up for commit c2c2c7e225.  It further clarifies the
following in the initcap function documentation:

 * Document that title case is used for digraphs in specific locales,
 * Reference particular ICU function used,
 * Add note about the purpose of the function.

Discussion: 
https://postgr.es/m/804cc10ef95d4d3b298e76b181fd9437%40postgrespro.ru
Author: Oleg Tselebrovskiy <o.tselebrovs...@postgrespro.ru>
Co-authored-by: Alexander Korotkov <aekorot...@gmail.com>
Reviewed-by: Jeff Davis <pg...@j-davis.com>
Reviewed-by: Peter Eisentraut <pe...@eisentraut.org>

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/f8ce9ed220b5edd8ba751706bbcdbcc5b64be66e

Modified Files
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doc/src/sgml/func/func-string.sgml | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

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