fix

doc/2.2_gdb&peda.md

@@ -229,11 +229,11 @@ $ yaourt -S peda
 - `assemble` -- On the fly assemble and execute instructions using NASM
   - `assemble`
   - ```
-  assemble $pc
-  > mov al, 0xb
-  > int 0x80
-  > end
-  ```
+    assemble $pc
+    > mov al, 0xb
+    > int 0x80
+    > end
+    ```
 - **`checksec`** -- 检查二进制文件的安全选项
 - `cmpmem` -- Compare content of a memory region with a file
   - `cmpmem 0x08049000 0x0804a000 data.mem`
@@ -425,16 +425,16 @@ $ yaourt -S peda
     ```
 - 外部脚本
   - ```
-  # myscript.py
-  def myrun(size):
-      argv = cyclic_pattern(size)
-      peda.execute("set arg %s" % argv)
-      peda.execute("run")
-  ```
-  ```
-  gdb-peda$ source myscript.py
-  gdb-peda$ python myrun(100)
-  ```
+    # myscript.py
+    def myrun(size):
+        argv = cyclic_pattern(size)
+        peda.execute("set arg %s" % argv)
+        peda.execute("run")
+    ```
+    ```
+    gdb-peda$ source myscript.py
+    gdb-peda$ python myrun(100)
+    ```
 
 下面我们通过一道 CTF 题目来练习一下 PEDA 脚本的编写：[asis-ctf-quals-2014 serial-number re-300](../src/Reverse/2.2_serial_number_300)
 ```