[GENERAL] Documentation inconsistency (at least to me)

I wonder why regexp_split_to_array() is listed under "String functions and operators" [1] but string_to_array() is
listedunder "Array functions and operators" [2] 

I find that a bit inconsistent - I would expect to find both in the same chapter.

I would suggest to put both into "String functions and operators" because after all string_to_array() does more or less
thesame as regexp_split_to_array() does. But at the end of the day I think it's just important that both are in the
samechapter (unless I overlooked a huge difference between the two that warrants this distinction). 


Thomas


[1] https://www.postgresql.org/docs/current/static/functions-string.html
[2] https://www.postgresql.org/docs/current/static/functions-array.html