Updated day9

"For example, if I want to pull from debugsociety into my branch2"
git pull debugsociety branch2 doesn't pull into your branch2. it pulls debugsociety's branch2 into whatever branch you're on right now.

It could be changed to this:
For example, if I want to pull *from* debugsociety's 'master' branch *into* my branch2 branch
git checkout branch2
git pull debugsociety master