Add explanation for extra parentheses in ELisp Introduction

* doc/lispintro/emacs-lisp-intro.texi (fwd-para while): Add
a note to explain the extra parentheses.  (Bug#67820)

(cherry picked from commit fba7b9db39771edbbc71a8122c7b0ea1ce24ec96)

diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi
index aaa7511ef30c0ecebee057c5de19609a077ae573..4a0e8dfa1fce3429816ad4919184bd33ae002939 100644 (file)
--- a/doc/lispintro/emacs-lisp-intro.texi
+++ b/doc/lispintro/emacs-lisp-intro.texi
@@ -13248,6 +13248,10 @@ The last expression when there is no fill prefix is
 @end smallexample
 
 @noindent
+(Note that this code snippet is copied verbatim from the original code,
+so the two extra ending parentheses are matching the previous @code{if}
+and @code{while}.)
+
 This says that if there is no fill prefix and if we are not at the
 end, point should move to the beginning of whatever was found by the
 regular expression search for @code{sp-parstart}.