UG: One long line only (instead of hard wrap at 80)

Developers are used with hard wrap at 80 columns, mainly because it makes sense
when talking about text, when each line has one command and is independent.

However, when working with human text, force the hard break at some arbitrary
column number - more than make the meaningless breaks - lead to unmanageable git
diffs when one word only is included.

Using one long line only (and configuring your modern editor to softwrap it at
your preferred column) provides better git diffs returns. For example using:

   $ git diff ‐‐color-words

or

   $ git diff | ~/src/git/contrib/diff-hightlight/diff-highlight

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>