Format better.

1.md

@@ -1,5 +1,10 @@
 # ls
 
+`ls` is used to LiSt files. It is notable for having one of the longest man
+pages in the UNIX standard suite.
+
+## Challenges
+
 All commands should be using `ls` and any options, and should be run from inside
 the `demo` dir. No other commands (or pipes, etc) are allowed.
 

2.md

@@ -1,5 +1,9 @@
 # mkdir
 
+`mkdir` is used to MaKe DIRectories.
+
+## Challenges
+
 All commands should be using `mkdir` and any options. No other commands (or pipes,
 etc) is allowed.
 

3.md

@@ -1,3 +1,7 @@
 # touch
 
+`touch` is used to create files. It is also used in a number of bad UNIX jokes.
+
+## Challenges
+
 * Create a file named `hello.txt`

8.md

@@ -11,3 +11,5 @@ Example:
     echo "hello i am gabe, my name is gabe" | sed 's/gabe/Jack'
     # shows the first 13 files/directories in the current directory
     ls -1 | head -13
+
+## Challenges