Fix contract on filebox to reflect documentation.

original commit: b8d3219b1b8000f367f6660f09e1870a2b857b72

collects/scribble/private/manual-style.rkt

@@ -22,7 +22,7 @@
          itemize
          aux-elem
          code-inset)
-(provide/contract [filebox ((or/c core:element? string?) pre-flow? . -> . block?)])
+(provide/contract [filebox (((or/c core:element? string?)) () #:rest (listof pre-flow?) . ->* . block?)])
 
 (define styling-f/c
   (() () #:rest (listof pre-content?) . ->* . element?))

collects/tests/scribble/docs/filebox.scrbl

@@ -0,0 +1,12 @@
+#lang scribble/manual
+
+@; An empty filebox
+@filebox["zero.txt"]
+
+@filebox["one.txt"]{
+A file box with one thing in it.
+}
+
+@filebox["two.txt" 
+(tt "A filebox ")
+(tt "with multiple things in it.")]

collects/tests/scribble/docs/filebox.txt

@@ -0,0 +1,7 @@
+"zero.txt"
+
+"one.txt"
+A file box with one thing in it.
+
+"two.txt"
+A filebox with multiple things in it.