doc: Re-format the translator tutorial

Adjutst whitespace so that things don't overflow in PDF.

Change-Id: Ic75abccbe744aac327b1c6311afb4c13271a723d
Signed-off-by: Lubomir Rintel <lubo.rintel@gooddata.com>
Reviewed-on: http://review.gluster.org/5481
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Vijay Bellur <vbellur@redhat.com>