Doc: improve documentation for ^@ starts-with operator.

This operator wasn't formally documented anywhere.  To give it
a natural home, relabel the functions-string-other table as
"Other String Functions and Operators", which is more parallel
to the functions-string-sql table anyway.

While here, add cross-references to the pattern match and text
search sections.  It seems moderately likely that people would
come to this section looking for those (but I don't want to
actually list them in these tables).

Discussion: 
https://postgr.es/m/cadt4rqb13kqhojqqq+wxmytjruks2uifdtftvt-xa3qylyb...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/2ae5d72f004f599c351ee31e8da5fb3e40303760

Modified Files
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doc/src/sgml/func.sgml | 41 +++++++++++++++++++++++++++++++++--------
1 file changed, 33 insertions(+), 8 deletions(-)

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