Correct an attribute access example.

gcc/ChangeLog:
	* doc/extend.texi (attribute access): Correct an example.

gcc/ChangeLog

+2020-02-25  Martin Sebor  <msebor@redhat.com>
+
+	* doc/extend.texi (attribute access): Correct an example.
+
 2020-02-25  Mihail Ionescu  <mihail.ionescu@arm.com>
 
 	* config/aarch64/aarch64-builtins.c (aarch64_scalar_builtin_types):

gcc/doc/extend.texi

@@ -2526,7 +2526,7 @@ the @code{puts} function, or the second and third arguments to
 the @code{memcpy} function.
 
 @smallexample
-__attribute__ ((access (read_only))) int puts (const char*);
+__attribute__ ((access (read_only, 1))) int puts (const char*);
 __attribute__ ((access (read_only, 1, 2))) void* memcpy (void*, const void*, size_t);
 @end smallexample