This patch completes missing help text for some options under CONFIG_DEVEL.

Provides help for BINARY_FOLDER and DOWNLOAD_FOLDER, and reduces ambiguity in the
help for BUILD_SUFFIX with an example.

Signed-off-by: Andrew McDonnell <bugs@andrewmcdonnell.net>
Fix whitespace typo
Merge branch 'my_patches_submitted' into working

Conflicts:
	config/Config-devel.in