DOCS: 'Build a WinPE image docs' need updated

The docs here needed updated: https://docs.puppet.com/pe/latest/razor_windows_install.html#build-a-winpe-image

• Step 2 says to copy the build-winpe directory from the Razor server but doesn't say where that is or how to get it. (/opt/puppetlabs/server/apps/razor-server/share/razor-server/build-winpe)
• Step 2 says to "use this archive" with a link to a zip on AWS. That zip is outdated and needs to be updated. (Done, no change needed here.)
• Step 4 says to put *.inf files in the build-winpe directory but doesn't say where that directory is. (Should be the `extra-drivers` directory inside the build-winpe folder above.
• Step 4 should clarify weather it's okay or not to put directories containing *.inf files in there (it seems to be okay and is common for vendors to ship larges folders of inf files) (This will search subdirectories too.)