Update Building the source code

Building-the-source-code.md

@@ -9,6 +9,7 @@ The Docker images set up all the requirements and dependencies for both the nati
 5. Run the build command:
   - Linux: `docker run --rm -ti --user $(id -u) -v ./:/src/dtmt dtmt-ci-base-linux cargo --color always build --profile release-lto --locked`
   - Windows: `docker run --rm -ti --user $(id -u) -v ./:/src/dtmt dtmt-ci-base-msvc cargo --color always build --release --target x86_64-pc-windows-msvc --locked -Zbuild-std`
+6. Find the exectuables in `target/release-lto` or `target/x86_64-pc-windows-msvc/release`.
 
 ## Native build