Add documentation for changes to Show Paren mode.
* lisp/paren.el (show-paren-highlight-openparen): Enhance doc string. * doc/emacs/programs.texi (Matching): Add descriptions of some pertinent user options, including the new show-paren-when-point-inside-paren and show-paren-when-point-in-periphery. * etc/NEWS (.. Specialized Modes ...): Add an entry for Show Paren mode. Move an entry on pcase to the Lisp Changes section.
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