(custom-mode-map, custom-mode-link-map):

(custom-mode-map, custom-mode-link-map):
Rename `custom-mode' to `Custom-mode' in docstrings.
(custom-buffer-create-internal, customize-browse):
Rename `custom-mode' to `Custom-mode'.
(custom-mode-hook): Rename to `Custom-mode-hook'.
(Custom-mode-hook): Renamed from `custom-mode-hook'.
(custom-mode): Rename to `Custom-mode'.
(Custom-mode): Renamed from `custom-mode'.  Doc fix.
(custom-mode): Add backward-compatible non-interactive variant of
`Custom-mode' that simply calls `Custom-mode'.  Mark it obsoleted.
(custom-mode-hook): Mark it as obsolete alias of `Custom-mode-hook'.