The bold text in the command examples wasn't a typographical accident; it looks like most of them got lost in translation, and those that weren't were turned from <strong> to <b>. I've just gone through restoring the bold where it had gone missing (but sticking to the <b> - maybe the CSS is happier with that; it looked OK in preview though).

As explained, hopefully, on page 3, when boldface is used in all the following command examples throughout the howto, that means that those commands can be skipped by the user if they carried out the optional step 4.2 to carry out the software build in one go, rather than building and installing the software as they go along as per the versions of this howto for binary distributions. (I added the option to do it all in advance simply because it is a source distribution, and as such the installation stages can take some time.)