Merge pull request torvalds#6 from calee0219/patch-1

Make markdown seems right

Author: yuan

README.md

@@ -3,55 +3,55 @@ Linux-0.11
 
 The old Linux kernel source ver 0.11 which has been tested under modern Linux,  Mac OSX and Windows.
 
-##1. Build on Linux
+## 1. Build on Linux
 
-##1.1. Linux Setup
+### 1.1. Linux Setup
 
 * a linux distribution: debian , ubuntu and mint are recommended
 * some tools: gcc gdb qemu
 * a linux-0.11 hardware image file: hdc-0.11.img, please download it from http://www.oldlinux.org, or http://mirror.lzu.edu.cn/os/oldlinux.org/, ant put it in the root directory.
 * Now, This version already support the Ubuntu 16.04, enjoy it.
 
-##1.2. hack linux-0.11
+### 1.2. hack linux-0.11
+```bash
+$ make help		// get help
+$ make  		// compile
+$ make start		// boot it on qemu
+$ make debug		// debug it via qemu & gdb, you'd start gdb to connect it.
+```
+```gdb
+$ gdb tools/system
+(gdb) target remote :1234
+(gdb) b main
+(gdb) c
+```
 
-    $ make help		// get help
-    $ make  		// compile
-    $ make start		// boot it on qemu
-    $ make debug		// debug it via qemu & gdb, you'd start gdb to connect it.
+## 2. Build on Mac OS X
 
-    $ gdb tools/system
-    (gdb) target remote :1234
-    (gdb) b main
-    (gdb) c
-
-
-##2. Build on Mac OS X
-
-##2.1. Mac OS X Setup
+### 2.1. Mac OS X Setup
 
 * install cross compiler gcc and binutils
 * install qemu
 * install gdb. you need download the gdb source and compile it to use gdb because port doesn't provide i386-elf-gdb, or you can use the pre-compiled gdb in the tools directory.
 * a linux-0.11 hardware image file: hdc-0.11.img
 
-#
-    $ sudo port install qemu
-    $ sudo port install i386-elf-binutils i386-elf-gcc
+```bash
+$ sudo port install qemu
+$ sudo port install i386-elf-binutils i386-elf-gcc
+```
 
 optional
+```bash
+$ wget ftp://ftp.gnu.org/gnu/gdb/gdb-7.4.tar.bz2
+$ tar -xzvf gdb-7.4.tar.bz2
+$ cd gdb-7.4
+$ ./configure --target=i386-elf
+$ make
+```
 
-    $ wget ftp://ftp.gnu.org/gnu/gdb/gdb-7.4.tar.bz2
-    $ tar -xzvf gdb-7.4.tar.bz2
-	$ cd gdb-7.4
-	$ ./configure --target=i386-elf
-	$ make
-
-
-##2.2. hack linux-0.11
-
-	same as section 1.2
-
+### 2.2. hack linux-0.11
+same as section 1.2
 
-##3. Build on Windows
 
-	todo...
+## 3. Build on Windows
+todo...