* lisp/emacs-lisp/pcase.el (\`): Extend semantics of QPATS to all
numbers. Add a comment explaining why we disallow some atoms as
QPATS.
* doc/lispref/control.texi (Backquote Patterns): Update the paragraph
explaining QPATS. Remove a sentence suggesting an analogy between
QPATS to self-quoting objects.