Review of solutions

Wenshan,

I've reviewed your excellent solutions to the exercises in the Emacs Lisp Intro.  I found a few typos, I fixed a lot of the docstrings and some of the user prompts and displayed messages.   I didn't find any major problems.

There may have been a bug in the solution for chapter 5.  Although, you couldn't tell.  I found it when I tried to change the message.  It should be fixed.

I fixed exercise 4 in chapter 11 rewriting it using only the functions that had been introduced so far.  It's a confusing exercise because there is no explanation of what a Texinfo index entry should look lite.

If you have any questions, let me know.
Aaron