move the redex scrbl files into a scribblings subcollection and adjust timeouts

collects/meta/props

@@ -1231,7 +1231,8 @@ path/s is either such a string or a list of them.
 "collects/redex/private/size-snip.rkt" drdr:command-line (gracket-text "-t" *)
 "collects/redex/private/stepper.rkt" drdr:command-line (gracket-text "-t" *)
 "collects/redex/private/traces.rkt" drdr:command-line (gracket-text "-t" *)
-"collects/redex/private/tut.scrbl" drdr:timeout 300
+"collects/redex/scribblings/tut.scrbl" drdr:timeout 300
+"collects/redex/redex.scrbl" drdr:timeout 300
 "collects/redex/tests/bitmap-test-util.rkt" drdr:command-line (gracket-text "-t" *)
 "collects/redex/tests/bitmap-test.rkt" drdr:command-line (mzc "-k" *)
 "collects/redex/tests/check-syntax-test.rkt" drdr:command-line (mzc *)

collects/redex/redex.scrbl

@@ -19,8 +19,8 @@ and the @tt{examples} subdirectory in the @tt{redex} collection.
 
 @table-of-contents[]
 
-@include-section["private/tut.scrbl"]
-@include-section["private/ref.scrbl"]
+@include-section["scribblings/tut.scrbl"]
+@include-section["scribblings/ref.scrbl"]
 
 @index-section[]