[racket-dev] doc update to ffi/cvector; hopefully factual

Based on my experiments, I added this to the docs (not pushed until I'm ready to stop work). Let me know if it's not true:

uccello:~/plt/collects/scribblings/foreign clements$ git diff cvector.scrbl
diff --git a/collects/scribblings/foreign/cvector.scrbl b/collects/scribblings/foreign/cvector.scrbl
index 750989d..6c4f2a6 100644
--- a/collects/scribblings/foreign/cvector.scrbl
+++ b/collects/scribblings/foreign/cvector.scrbl
@@ -25,7 +25,8 @@ needed.}
 @defproc[(make-cvector [type ctype?] [length exact-nonnegative-integer?]) cvector?]{
 
 Allocates a C vector using the given @scheme[type] and
- at scheme[length].}
+ at scheme[length]. The resulting vector is not guaranteed to 
+contain any particular values.}
 
 
 @defproc[(cvector [type ctype?] [val any/c] ...) cvector?]{

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