Fix clang-cl path in Windows build guide

Author: egorzhdan

docs/WindowsBuild.md

@@ -162,7 +162,7 @@ ninja -C S:\b\libdispatch check
 ## Build swift-corelibs-foundation
 
 ```cmd
-cmake -B S:\b\foundation -D CMAKE_BUILD_TYPE=RelWithDebInfo -D CMAKE_C_COMPILER=S:/b/toolchain/clang-cl.exe -D CMAKE_Swift_COMPILER=S:/b/toolchain/bin/swiftc.exe -D CURL_LIBRARY="S:/Library/libcurl-development/usr/lib/libcurl.lib" -D CURL_INCLUDE_DIR="S:/Library/libcurl-development/usr/include" -D ICU_ROOT="S:/Library/icu-64" -D ICU_INCLUDE_DIR=S:/Library/icu-64/usr/include -D LIBXML2_LIBRARY="S:/Library/libxml2-development/usr/lib/libxml2s.lib" -D LIBXML2_INCLUDE_DIR="S:/Library/libxml2-development/usr/include/libxml2" -D ENABLE_TESTING=NO -D dispatch_DIR=S:/b/libdispatch/cmake/modules -G Ninja -S S:\swift-corelibs-foundation
+cmake -B S:\b\foundation -D CMAKE_BUILD_TYPE=RelWithDebInfo -D CMAKE_C_COMPILER=S:/b/toolchain/bin/clang-cl.exe -D CMAKE_Swift_COMPILER=S:/b/toolchain/bin/swiftc.exe -D CURL_LIBRARY="S:/Library/libcurl-development/usr/lib/libcurl.lib" -D CURL_INCLUDE_DIR="S:/Library/libcurl-development/usr/include" -D ICU_ROOT="S:/Library/icu-64" -D ICU_INCLUDE_DIR=S:/Library/icu-64/usr/include -D LIBXML2_LIBRARY="S:/Library/libxml2-development/usr/lib/libxml2s.lib" -D LIBXML2_INCLUDE_DIR="S:/Library/libxml2-development/usr/include/libxml2" -D ENABLE_TESTING=NO -D dispatch_DIR=S:/b/libdispatch/cmake/modules -G Ninja -S S:\swift-corelibs-foundation
 ninja -C S:\b\foundation
 ```