Various small changes in addition to the following.

Various small changes in addition to the following.
(Converting Representations): Clarify behavior of
`string-make-multibyte' and `string-to-multibyte' for unibyte all
ASCII arguments.
(Character Sets): Document the variable `charset-list' and adapt the
definition of the function `charset-list' accordingly.
(Translation of Characters): Clarify use of generic characters in
`make-translation-table'.  Clarify and correct the description of the
use of translation tables in encoding and decoding.
(User-Chosen Coding Systems): Correct and clarify the description of
`select-safe-coding-system'.
(Default Coding Systems): Clarify description of `file-coding-system-alist'.