[docs]Update docs

docs/source/5_advanced/gdb_debug.md

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+# GDB debug
+
+Debugging ROS 2 programs with GDB involves several steps:
+
+## Config debug
+
+Set `CMAKE_BUILD_TYPE` to `Debug`  in ` orbbec_camera/CMakeLists.txt`
+
+```
+set(CMAKE_BUILD_TYPE Debug)
+```
+
+## Use xterm terminal to open gdb debugging
+
+Install xterm
+
+```bash
+sudo apt install xterm
+```
+
+Take gemini_330_series.launch.py as an example to use xterm terminal to open gdb
+
+![Multi_camera1](../image/gdb_1.png)