texinfo-parse-line-arg
texinfo-parse-line-arg is a compiled Lisp function in `texinfmt.el
'.
(texinfo-parse-line-arg)
Return argument of @-command as string.
Argument is separated from command either by a space or by a brace.
If a space, return rest of line, with beginning and ending white
space removed. If a brace, return string between braces.
Leave point after argument.