Fix spelling in docbook comments, code comments, and a local variable
name. Thanks to "ispell -h" for docbook HTML and "scspell" for source
code.
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Since gtk-mkhtml is executed in a sub-directory of the build directory, and
make does not know of that, the $(buildir) variable will still be "." and
the $(srcdir) will not properly be found. For this reason, use the absolute
variants for the two functions, which won't be changing.
