message: [transaction builder generator] update README file
  Closes:
diff: @@ -59,7 +59,7 @@ target/debug/generate-transaction-builders \
  ```
  Next, you may copy and execute the [Python demo file](examples/python3/stdlib_demo.py) with:
  ```
  -cp language/transaction-builder-generator/examples/python3/stdlib_demo.py "$DEST"
  +cp language/transaction-builder/generator/examples/python3/stdlib_demo.py "$DEST"
  PYTHONPATH="$PYTHONPATH:$DEST" python3 "$DEST/stdlib_demo.py"
  ```
  @@ -76,27 +76,27 @@ target/debug/generate-transaction-builders \
  ```
  Next, you may copy and execute the [C++ demo file](examples/cpp/stdlib_demo.cpp) with:
  ```
  -cp language/transaction-builder-generator/examples/cpp/stdlib_demo.cpp "$DEST"
  +cp language/transaction-builder/generator/examples/cpp/stdlib_demo.cpp "$DEST"
  clang++ --std=c++17 -I "$DEST" "$DEST/libra_stdlib.cpp" "$DEST/stdlib_demo.cpp" -o "$DEST/stdlib_demo"
  "$DEST/stdlib_demo"
  ```
  ### Java
  -To install Java source packages `com.facebook.serde`, `com.facebook.lcs`, `org.libra.types`, and a class `org.libra.stdlib.Stdlib` into a target directory `$DEST`, run:
  +To install Java source packages `com.facebook.serde`, `com.facebook.lcs`, `org.libra.types`, and `org.libra.stdlib` into a target directory `$DEST`, run:
  ```bash
  target/debug/generate-transaction-builders \
  --language java \
  - --module-name org.libra.stdlib.Stdlib \
  + --module-name org.libra.stdlib \
  --with-libra-types "testsuite/generate-format/tests/staged/libra.yaml" \
  --target-source-dir "$DEST" \
  "language/stdlib/compiled/transaction_scripts/abi"
  ```
  Next, you may copy and execute the [Java demo file](examples/java/StdlibDemo.java) with:
  ```
  -cp language/transaction-builder-generator/examples/java/StdlibDemo.java "$DEST"
  +cp language/transaction-builder/generator/examples/java/StdlibDemo.java "$DEST"
  (find "$DEST" -name "*.java" | xargs javac -cp "$DEST")
  -java -cp "$DEST" StdlibDemo
  +java -enableassertions -cp "$DEST" StdlibDemo
  ```
  ### Rust (experimental)
  