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These functions aren't exact inverses, but they're closely related; yet we document them in two different sections. Add cross-ref <link>s to improve that situation. While here, move the strpos and substr entries to re-alphabetize Table 9.10. Also, drop an ancient compatibility note about string_to_array, which wasn't even on the right page, so probably few people ever saw it. Discussion: https://postgr.es/m/164287017550.704.5840412183184961677@wrigleys.postgresql.org