Revert "Fixed comment for pandas.unique"
Reverts pandas-dev/pandas#39557
xref https://github.com/pandas-dev/pandas/pull/39557#issuecomment-774667542

but maybe no harm keeping on 1.2.x thanks @simonjayhawkins  @meeseeksdev backport 1.2.x Can't Dooooo.... It seem like this is already backported (commit is empty).I won't do anything. MrMeeseeks out.