[typo] change --with-sdks to --enable-sdk

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@1567 4407c894-4637-0410-b4f5-ada5f102cad1

mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt

diff --git a/mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt b/mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt
index 4ece821..06818a2 100644
--- a/mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt
+++ b/mingw-w64-doc/howto-build/mingw-w64-howto-build-adv.txt
@@ -280,7 +280,7 @@
 When you checkout the svn trunk from the mingw-w64 developer repository, there
 should be a directory called mingw-w64-headers. Install it with:
 	../path/to/mingw-w64-headers/configure --prefix=<prefix> \
-	--with-sdks=none --build=<host triplet> --host=x86_64-w64-mingw32
+	--enable-sdk=none --build=<host triplet> --host=x86_64-w64-mingw32
 	make install
 
 To view the available sdks, use --help. The prefix should be similar to the