Emacs Maintainers,
Several searches at debbugs.gnu.org did not turn up any reports for this minor documentation omission.
The NEWS file for Emacs 26.2/.3 documents changes to `thing-at-point', including mention of the function `list-at-point'. C-h f (describe-function) provides documentation of `list-at-point', but C-h S (info-lookup-symbol) for `list-at-point' responds with "Not documented as a symbol: list-at-point'. A check of the node in the elisp manual that documents `thing-at-point' does not show any mention of `list-at-point', nor does the previous node ("Near Point"). If `list-at-point' is documented elsewhere in the elisp manual, then an index manual entry is needed for this function. Without this documentation, it is still possible to use `list-at-point', but when it is not documented in the manual, users might not know that it exists.
(End of report.)