fix define-get/put-id example (PR 10334); merge to 4.2.1

svn: r15490

collects/scribblings/guide/pattern-macros.scrbl

@@ -304,11 +304,11 @@ Naturally, we can implement @scheme[define-get/put-id] as a macro:
 
 @schemeblock[
 (define-syntax-rule (define-get/put-id id get put!)
-  (define-syntax clock
+  (define-syntax id
     (syntax-id-rules (set!)
-      [(set! clock e) (put-clock! e)]
-      [(clock a (... ...)) ((get-clock) a (... ...))]
-      [clock (get-clock)])))
+      [(set! id e) (put! e)]
+      [(id a (... ...)) ((get) a (... ...))]
+      [id (get)])))
 ]
 
 The @scheme[define-get/put-id] macro is a @deftech{macro-generating