Swapped video URL lines 24 and 25

Obviously, I've been learning about git :-) I noticed when watching the videos that the vids and pages for Local Repos and Git Branching. So in this change I swapped the embed URLs for the two (in lines 24 and 25) so the pages and videos match up.
Merge pull request #20 from gbrettmiller/gh-pages

Swapped video URL lines 24 and 25         -Nice catch Brett!