Remove the warnings: they don't really work as intended.

[SVN r31154]

doc/Jamfile.v2

@@ -17,12 +17,3 @@ boostbook standalone
 install html : ../../../doc/html/boostbook.css ;
 install ../ : ../../../boost.png ;
 
-if ! $(gWARNING_DONE)
-{
-   ECHO ;
-   ECHO This Jamfile is for testing the Type Traits documentation build only ;
-   ECHO If you want to update your distributed documentation then please build ;
-   ECHO from the boost-path/doc directory ;
-   ECHO ;
-   gWARNING_DONE = "true" ;
-}