Linux-GDB-command.md: 新增 "3.9 打印变量的类型和文件"
Linux-GDB-command.md: 新增 "3.9 打印变量的类型和文件"

Signed-off-by: XiongHui Guo <c816ee361b8bcaf7cf19d627e3bc89a63016b2b4@msn.com>

shines77/my_docs,shines77/my_docs,shines77/my_docs,shines77/my_docs