Обсуждение: pgsql: Document jsonpath .** accessor with nesting level filter

Document jsonpath .** accessor with nesting level filter

It appears that some variants of .** jsonpath accessor are undocumented.  In
particular undocumented variants are:

 .**{level}
 .**{lower_level to upper_level}
 .**{lower_level to last}

This commit adds missing documentation for them.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/e0e3dad770d3eefc4ee6cd562d9c25b61c263a6e

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