scheme/gui doc fixes (ok to merge to 4.1.4)

svn: r13222

original commit: 20fad3e2b88ce0c783e5a644aff0fcb8da955415

collects/scribblings/gui/editor-stream-in-base-class.scrbl

@@ -21,10 +21,10 @@ Returns @scheme[#t] if there has been an error reading from the
 
 }
 
-@defmethod[(read [data (and/c bytes? (not/c immutable?))])
+@defmethod[(read [data (and/c vector? (not immutable?))])
            exact-nonnegative-integer?]{
 
-Reads characters to fill the supplied vector. The return value is the
+Reads Latin-1 characters to fill the supplied vector. The return value is the
  number of characters read, which may be less than the number
  requested if the stream is emptied. If the stream is emptied, the
  next call to @method[editor-stream-in-base% bad?] must return

collects/scribblings/gui/editor-stream-out-base-class.scrbl

@@ -36,9 +36,9 @@ Returns the current stream position.
 
 }
 
-@defmethod[(write [data bytes?])
+@defmethod[(write [data (listof char?)])
            void?]{
 
-Writes data to the stream.
+Writes data (encoded as Latin-1 characters) to the stream.
 
 }}

collects/scribblings/gui/text-class.scrbl

@@ -9,7 +9,7 @@ A @scheme[text%] object is a standard text editor. A text editor is
 
 
 @defconstructor[([line-spacing (and/c real? (not/c negative?)) 1.0]
-                 [tab-stops (listof real?)]
+                 [tab-stops (listof real?) null]
                  [auto-wrap any/c #f])]{
 
 The @scheme[line-spacing] argument sets the additional amount of space