Remove trailing spaces in Windows build docs (#84693)

This changes the meaning of the command, causing the remaining arguments
to be truncated.

Author: jakepetroules

docs/WindowsBuild.md

@@ -128,7 +128,7 @@ cmake -B "S:\b\1" ^
   -D CMAKE_CXX_FLAGS="/GS- /Oy /Gw /Gy" ^
   -D CMAKE_EXE_LINKER_FLAGS="/INCREMENTAL:NO" ^
   -D CMAKE_MT=mt ^
-  -D CMAKE_SHARED_LINKER_FLAGS="/INCREMENTAL:NO" ^  
+  -D CMAKE_SHARED_LINKER_FLAGS="/INCREMENTAL:NO" ^
   -D LLVM_DEFAULT_TARGET_TRIPLE=x86_64-unknown-windows-msvc ^
   -D LLVM_ENABLE_PDB=YES ^
   -D LLVM_EXTERNAL_CMARK_SOURCE_DIR=S:\cmark ^