gh-100925: Move array methods under class in array doc (GH-101485)

* Move array methods under class in array doc

* Fix a few internal references related to the touched lines
(cherry picked from commit 1b6045668d233269f667c4658c7240256f37f111)

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>