[PATCH] docs: remove spurious @example wrapping

["Colin Woodbury" <colin@fosskers.ca>]

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This patch removes a spurious layer of @example wrapping, which looks a little strange in the rendered documentation. See the bottom of https://www.gnu.org/software/emacs/manual/html_node/elisp/Defining-Macros.html for the issue.

Cheers,
Colin

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diff --git a/doc/lispref/macros.texi b/doc/lispref/macros.texi
index b8df363614..cf23ecb9d4 100644
--- a/doc/lispref/macros.texi
+++ b/doc/lispref/macros.texi
@@ -240,7 +240,6 @@ they cannot be called interactively.
 of constants and nonconstant parts.  To make this easier, use the
 @samp{`} syntax (@pxref{Backquote}).  For example:
 
-@example
 @example
 @group
 (defmacro t-becomes-nil (variable)
@@ -253,7 +252,6 @@ of constants and nonconstant parts.  To make this easier, use the
      @equiv{} (if (eq foo t) (setq foo nil))
 @end group
 @end example
-@end example
 
 @node Problems with Macros
 @section Common Problems Using Macros