Documentation changes.

* Small change in define-scoped-transformers.scrbl
* expand-syntax-tree-with-expanders-of-type was called expand-stx-tree-with-expanders-of-type in the docs.
* define-id-expander instead of define-id-expander?

private/define-expanders.scrbl

@@ -17,7 +17,7 @@ expanders for use with other macros.
    with @code{id-expander-type}}
  @item{@code{id-expander?} - a predicate bound at phase level 1
    recognizing expanders produced by @code{make-id-expander}}
- @item{@code{define-id-expander?} - a syntactic form at phase level
+ @item{@code{define-id-expander} - a syntactic form at phase level
    0 that takes an identifier and a transformer procedure and binds the
    identifier as a @code{id-expander?} for use in a transformer
    environment}

private/define-scoped-transformers.scrbl

@@ -9,6 +9,6 @@ and friends.
 @defform[(define-syntax-with-scoped-pre-transformers id
            ([stx-lens pre-transformer] ...)
            transformer-expr)]{
- Binds @racket[id] as a syntax transformer equivalent to
+ Binds @racket[id] as a syntax transformer that is equivalent to
- @racket[with-scoped-pre-transformers transformer-expr ([stx-lens pre-transformer] ...)].
+ @racket[(with-scoped-pre-transformers transformer-expr ([stx-lens pre-transformer] ...))].
 }

private/expanders.scrbl

@@ -26,7 +26,7 @@ expansion context.
  (define exp (expander A (λ (stx) stx)))
  (expander-of-type? A exp)]}
 
-@defproc[(expand-stx-tree-with-expanders-of-type [type expander-type?] [syntax syntax?]) syntax?]{
+@defproc[(expand-syntax-tree-with-expanders-of-type [type expander-type?] [syntax syntax?]) syntax?]{
  Recursively searches through @racket[syntax] for identifiers bound to
  generic syntax expanders of the given type. When an expander is found,
  its transformer is called with the given syntax value of its location