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Update 'instructions_custom_topics.md'

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instructions_custom_topics.md
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@ -125,14 +125,14 @@ publishing #1: pubsub_msg.msg.CustomMsg2(pitch_ctrl=33.33, yaw_ctrl=0.5)..._
## Python Package (eg. /pubsub)
This package contains your scripts, programs and libraries. After building the workspace (`colcon build`) the custom messages are available to all other packages.
This package can be created as a CMake (C++) package or as a python package depending on your coding preference.
* C++: `ros2 pkg create --build-type ament-cmake <package_name>`
* Python: `ros2 pkg create --build-type ament-python <package_name>`
This package can be created as a CMake (C++) package or as a python package depending on your coding preference, e.g.
* C++: `ros2 pkg create --build-type ament_cmake <package_name>`
* Python: `ros2 pkg create --build-type ament_python <package_name>`
<package_name> directory:
* This directory contains your python scripts (eg. listener.py)
* Also place the non-standard libraries in this directory and import the library in your python scripts
* Also place non-standard libraries in this directory and import them in your python scripts
### 1. Create Python Package