Update PYTHONPATH in development.md (#2644)

Modify PYTHONPATH to new related directory in docs.

Author: yinrun

build_tools/write_env_file.sh

@@ -13,7 +13,7 @@ portable_realpath() {
 
 td="$(portable_realpath "$(dirname "$0")"/..)"
 build_dir="$(portable_realpath "${TORCH_MLIR_BUILD_DIR:-$td/build}")"
-python_packages_dir="$build_dir/python_packages"
+python_packages_dir="$build_dir/tools/torch-mlir/python_packages"
 
 write_env_file() {
   echo "Updating $build_dir/.env file"

docs/development.md

@@ -109,13 +109,13 @@ cmake --build build
 ### Linux and macOS
 
 ```shell
-export PYTHONPATH=`pwd`/build/python_packages/torch_mlir:`pwd`/projects/pt1/examples
+export PYTHONPATH=`pwd`/build/tools/torch-mlir/python_packages/torch_mlir:`pwd`/projects/pt1/examples
 ```
 
 ### Windows PowerShell
 
 ```shell
-$env:PYTHONPATH = "$PWD/build/python_packages/torch_mlir;$PWD/projects/pt1/examples"
+$env:PYTHONPATH = "$PWD/build/tools/torch-mlir/python_packages/torch_mlir;$PWD/projects/pt1/examples"
 ```
 
 ## Testing MLIR output in various dialects
@@ -126,7 +126,7 @@ Make sure you have activated the virtualenv and set the `PYTHONPATH` above
 (if running on Windows, modify the environment variable as shown above):
 ```shell
 source mlir_venv/bin/activate
-export PYTHONPATH=`pwd`/build/tpython_packages/torch_mlir:`pwd`/projects/pt1/examples
+export PYTHONPATH=`pwd`/build/tools/torch-mlir/python_packages/torch_mlir:`pwd`/projects/pt1/examples
 python projects/pt1/examples/torchscript_resnet18_all_output_types.py
 ```