[AC21.4] Cleanup of the CCL coding system example.

NOTE: This patch has been committed. APPROVE COMMIT 21.5 RECOMMEND 21.4 This has been in my queue for far too long. man/ChangeLog addition: 2005-03-26 Aidan Kehoe <kehoea(a)parhasard.net&gt; * lispref/mule.texi (CCL Example): char-int -> char-to-int, and hex 41 is decimal 64, both problems with my previous patch pointed out by Stephen. * lispref/mule.texi (The actual coding system): Give information on the make-coding-system call, and where the actual package can be found.