[doc] Remove pasto in __builtin_extend_pointer doc

2018-03-21  Tom de Vries  <tom@codesourcery.com>

	* doc/extend.texi (__builtin_extend_pointer): Remove pasto.

From-SVN: r258750

gcc/ChangeLog

+2018-03-21  Tom de Vries  <tom@codesourcery.com>
+
+	* doc/extend.texi (__builtin_extend_pointer): Remove pasto.
+
 2018-03-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/84960

gcc/doc/extend.texi

@@ -12426,7 +12426,6 @@ of an actual hardware address this function returns the extended user
 pointer.  Targets where this is true included ILP32 mode on x86_64 or
 Aarch64.  This function is mainly useful when writing inline assembly
 code.
-@var{addr}
 @end deftypefn
 
 @node Target Builtins