consume a newline following `}'.
(texinfo-format-email): New function.
(toplevel): Use texinfo-format-email for @email.
(texinfo-format-kbd-regexp, texinfo-format-kbd-end-regexp): Add
`display'.
(texinfo-sort-region): Goto point-min before sorting.
(texinfo-set): Remove leading white space from value.
From yagi@is.titech.ac.jp.