Building on the previous commit, this makes use of a trailing @ to
split long @deffn lines in the guile.texi source file. This splitting
doesn't change how the document is laid out by texinfo.
I have also wrapped keyword and argument name pairs in @w{...} to
prevent line breaks appearing between the two. I've currently only
done this for the longer @deffn lines, where a line break is
possible. This makes the @deffn lines much nicer to read in the
generated pdf.
d50964864b
