Fixed typo.
Fixed typo.
Repaired a broken `@multitable'.
Up to `fill-in-date!'.
Up to section `Environment Variables'.
Up to subsection `Path lists and colon lists'.
Up to section `Terminal device control'.
Up to subsection `Miscellaneous procedures'.

Also, changed all references to `Unix' to `UNIX' 'cos I likes it better.
Up to subsection `Using tty-info records'.
Up to subsection `Other terminal-device procedures'.