Added doc on how to checkout another user branch.

doc/internal/dev_start_guide.txt

@@ -87,7 +87,15 @@ You can keep you local repo up to date with central/master with those commands:
    git fetch central
    git merge central/master
 
-<<<<<<< HEAD
+If you want to fix a commit done in a pull request(i.e. fix small
+typo) to keep the history clean, you can do it like this:
+
+.. code-block:: bash
+
+   git checkout branch
+   git commit --amend
+   git push -u origin  my_shiny_feature:my_shiny_feature
+
 Cleaning up history
 -------------------
 
@@ -101,17 +109,16 @@ this. In summary:
   because intermediate commits can break blame (the bisecting tool).
 * `git merge --squash` will put all of the commits from your feature branch into one commit.
 * There are other tools that are useful if your branch is too big for one squash.
-=======
-If you want to fix a commit done in a pull request(i.e. fix small
-typo) to keep the history clean, you can do it like this:
+
+
+To checkout another user branch in his repo:
 
 .. code-block:: bash
 
-   git checkout branch
-   git commit --amend
-   git push -u origin  my_shiny_feature:my_shiny_feature
+   git remote add REPO_NAME HIS_REPO_PATH
+   git checkout -b LOCAL_BRANCH_NAME REPO_NAME/REMOVE_BRANCH_NAME
 
-You can find more information and tips in the `numpy development
+You can find move information and tips in the `numpy development
 <http://docs.scipy.org/doc/numpy/dev/gitwash/development_workflow.html>`_
 page.