Change array size description (again)

Hey Karl,

The changes you made in #7 made the "(no less!)" in the following sentence a little confusing:

 > The above array can hold up to 10 scores. No more (no less!). We can intialize the array with values:

I removed the "No more (no less!)" sentence all together and explicitly defined the bounds of the array instead. I also added a line break to better separate this thought and the initialization in the next section, as well as corrected the spelling of "initiated":

 > The above array can hold up to 10 scores using indexes `scores[0]` through `scores[9]`. Attempts to access an out of range index in the array will result in a compiler or runtime error.
 > 
 > We can initialize the array with values:

Let me know if you'd like me to split up these PRs or make any additional changes.

Thanks!