Updat some READMEs

1_false/README

@@ -1,4 +1,4 @@
-# False
+# false
 Fail successfully.
 
 ## Description
@@ -7,4 +7,6 @@ The program `false` asks the kernel to end its execution
 of the `sys_exit` system call.
 
 ## Usage
-`$ pwd`
+`$ false`
+
+## Comment

2_pwd/README

@@ -4,8 +4,9 @@ Print name of current working directory.
 ## Description
 The program `pwd` asks the kernel the name of its
 current working directory by mean of the `sys_pwd`
-system call and print it to std out by mean of
-`sys_write`.
+system call and print it to std out using `sys_write`.
 
 ## Usage
 `$ pwd`
+
+## Comment