Overhaul pcase documentation
Suggested by Drew Adams (Bug#31311). * doc/lispref/control.texi (Control Structures): Add "Pattern-Matching Conditional" to menu, before "Iteration". (Conditionals): Delete menu. (Pattern matching case statement): Delete node/subsection, by actually moving, renaming, and overhauling it to... (Pattern-Matching Conditional): ...new node/section. (pcase Macro): New node/subsection. (Extending pcase): Likewise. (Backquote Patterns): Likewise. * doc/lispref/elisp.texi (Top) In @detailmenu, add "Pattern-Matching Conditional" under "Control Structures" section and delete "Conditionals" section. * lisp/emacs-lisp/pcase.el (pcase): Rewrite docstring. (pcase-defmacro \` (qpat) ...): Likewise.
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