Review of porters-handbook changes

[Sergey Matveychuk]

Simon L. Nielsen wrote:
> There are some places where 8 spaces have been used instead of a tab
> (can be fixed by marking the regions and using 'meta-x tabify' in
> emacs').

I use vim :)
OK. I know how to do it with vim.

> Otherwise it looks OK to me, but I have only checked the markup, not the
> language.

Could somebody to fix it and commit? Or I have to do it as submitter? If 
  so, I'll add two variables description.

The language was checked by Joe Marcus Clarke.

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