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For the following release it is planned to make `if-let*' and
`when-let*' aliases for `if-let' and `when-let'.  For now we revert
declaring `if-let' and `when-let' obsolete and tweak the docstrings.

* lisp/emacs-lisp/subr-x.el (if-let*, when-let*): Make docstrings
refer to those of `if-let' and `when-let'.
(if-let, when-let): De-obsolete.  Rewrite documentation.