Hi,

The docstrings of `org-outline-level' and `org-current-level' contain
the undefined symbol name `org-odd-levels'.

The same lines of the docstrings contain also wording like
"Unlike to `org-current-level'" and "Unlike to `org-outline-level'"
  where "to" should not be there.

This patch changes the symbol names to `org-odd-levels-only' and
removes the "to" typos.

Regards -- Gerard