tp_3.md: update url

tp_3.md

@@ -8,7 +8,7 @@ For the last part of the TP you need to pair with someone else. We will refer to
 
 For **C** to be able to push to you repository, you need to grant him access.
 The gitbio access control is repository or branch-based.
-Go to the project **Settings**, tab and then to **Member**.
+Go to the project column **Manage**, tab and then to **Member**.
 You can search **C** and give him a role. Here we will use the role **Master** so **C** has as many rights as **W**.
 Click on **Add to project** to validate the changes.
 
@@ -178,3 +178,5 @@ To go further, you can study a few things that we did not cover here:
 - Cherry-Picking
 - Rewriting history (interactive rebasing)
 - Bisecting
+
+[Git book](https://git-scm.com/book/)