Fix #4: Clarify attempt to define syntax param id as normal var.

index.rkt

@@ -1353,13 +1353,24 @@ If we try to use @racket[it] outside of an @racket[aif] form, and
 (displayln it)
 ]
 
-But we can still define @racket[it] as a normal variable:
+But we can still define @racket[it] as a normal variable in local
+definition contexts like:
 
 @i[
-(define it 10)
-it
+(let ([it 10])
+  it)
 ]
 
+or:
+
+@i[
+(define (foo)
+  (define it 10)
+  it)
+(foo)
+]
+
+
 For a deeper look, see @hyperlink["http://www.schemeworkshop.org/2011/papers/Barzilay2011.pdf" "Keeping it Clean with Syntax Parameters"].
 
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