(toggle-enable-multibyte-characters, sort-coding-systems,

(toggle-enable-multibyte-characters, sort-coding-systems,
search-unencodable-char): Doc fixes.
(default-input-method, input-method-verbose-flag, input-method-highlight-flag):
Remove * in defcustom's docstrings.
(exit-language-environment-hook, set-default-coding-systems,
coding-system-change-eol-conversion, prefer-coding-system,
find-multibyte-characters, leim-list-entry-regexp, set-input-method,
input-method-exit-on-first-char, princ-list, locale-language-names,
locale-charset-language-names, define-char-code-property):
Fix typos in docstrings.