scribble: fix indentation in file examples (#27)

I copied in the actual file contents. It would perhaps be safest to do
some sort of "read the file and splice the contents in," but I'm not
sure how to do that at the moment.

brag/brag/brag.scrbl

@@ -538,6 +538,7 @@ Here's the definition for
   brag/examples/simple-line-drawing/semantics
   #:read my-read
   #:read-syntax my-read-syntax
+  #:info my-get-info
   #:whole-body-readers? #t
 
   (require brag/examples/simple-line-drawing/lexer
@@ -548,6 +549,13 @@ Here's the definition for
 
   (define (my-read-syntax src ip)
     (list (parse src (tokenize ip))))
+
+  (define (my-get-info key default default-filter)
+    (case key
+      [(color-lexer)
+       (dynamic-require 'syntax-color/default-lexer 'default-lexer)]
+      [else
+       (default-filter key default)]))
   }|
 }
 
@@ -577,19 +585,19 @@ compilation:
   (begin-for-syntax
     (define (compile-drawing drawing-stx)
       (syntax-parse drawing-stx
-  [({~literal drawing} rows-stxs ...)
+        [({~literal drawing} row-stxs ...)
 
        (syntax/loc drawing-stx
-  (begin rows-stxs ...))]))
+         (begin row-stxs ...))]))
 
-  (define (compile-rows rows-stx)
+    (define (compile-rows row-stx)
-  (syntax-parse rows-stx
+      (syntax-parse row-stx
         [({~literal rows}
           ({~literal repeat} repeat-number)
           chunks ... 
           ";")
 
-  (syntax/loc rows-stx
+         (syntax/loc row-stx
            (for ([i repeat-number])
              chunks ...
              (newline)))]))