Fix misspelled Python variable name and typos

Typos:
 - Update pathname in README.txt
 - Fix missing newlines in header update script.

Change-Id: Ib0e053f92a27ff10071b9805fa64e5653ab31b0c
diff --git a/libc/kernel/README.TXT b/libc/kernel/README.TXT
index 76dfa4d..9ff97d6 100644
--- a/libc/kernel/README.TXT
+++ b/libc/kernel/README.TXT
@@ -56,7 +56,7 @@
 
   * tools/update_all.py
     automatically update all clean headers from the content of 
-    'bionic/kernel/original'. this is the script you're likely going to 
+    'external/kernel-headers/original'. this is the script you're likely going to
     run whenever you update the original headers.
 
 NOTE: