That pattern is in fact symmetrical. Note where it says bind off at the beginning of the next 2 rows. When you're at the beginning of the second row, your on the same end as the end of the first row. See what I mean?
Pattern instructions often give headers that describe the over-all section of what you're working on. "Shape Raglan" is telling you you'll be working the decrease area that is typcial of Raglans. It's like if they say "Shape Cap" for when you're going to work the top/cap of a sleeve.
Nice diagram, BTW!
KnittingHelp Queen Bee
"There is a vitality, a life force, an energy, a quickening that is translated through you into action, and because there is only one of you in all of time, this expression is unique. And if you block it, it will never exist through any other medium and it will be lost. The world will not have it. It is not your business to determine how good it is nor how valuable nor how it compares with other expressions. It is your business to keep it yours clearly and directly, to keep the channel open. You do not even have to believe in yourself or your work. You have to keep yourself open and aware to the urges that motivate you. Keep the channel open."
— Martha Graham