[Docs] refine instructions in FAQ (#29)

Author: haochengxia

docs/src/en/faq.md

@@ -6,14 +6,14 @@
 
 2.  Get an error message like "cannot find Python package" when building.
 
-    The reason is that when building a Python binding package, we need the header and other necessary modules.
+    The reason is that building Python bindings requires Python's development headers and libraries.
 
-    If you can install software directly,
+    If you have administrative privileges, you can use your system's package manager to install the required package. For example:
+    *   **Debian/Ubuntu**: `sudo apt install python3-dev`
+    *   **RHEL/CentOS/Fedora**: `sudo yum install python3-devel`
+    *   **macOS**: Installing Python with Homebrew (`brew install python`) is usually sufficient.
 
-    ```shell
-    [sudo] apt install python3-dev
-    ```
-    If not, please install Python somewhere and set environment variables to help the building system find them.
+    Alternatively, if you installed Python in a custom location, you must set environment variables to help the build system find it. Remember to replace the placeholders in the command below with your actual paths.
 
     ```shell
     export CMAKE_ARGS="-DPython3_ROOT_DIR=${Python3_ROOT_DIR} -DPython3_INCLUDE_DIR=${Python3_INCLUDE_DIR} -DPython3_EXECUTABLE=${Python3_EXECUTABLE}"