Apply the changes also to the git boot camp.

Author: jaraco

getting-started/git-boot-camp.rst

@@ -47,7 +47,7 @@ You will only need to do this once.
 Cloning a Forked CPython Repository
 -----------------------------------
 
-You will only need to do this once.  From your command line::
+You will only need to do this once per machine.  From your command line::
 
    git clone git@github.com:<username>/cpython.git
 
@@ -58,6 +58,18 @@ It is also recommended to configure an ``upstream`` remote repository::
 
 You can also use SSH-based or HTTPS-based URLs.
 
+Configure the Remotes
+---------------------
+
+Configure ``git`` to pull ``main`` from the ``upstream`` remote::
+
+   git config --local branch.main.remote upstream
+
+Since one should never attempt to push to ``upstream``, configure
+``git`` to push always to ``origin``::
+
+   git remote set-url --push upstream git@github.com:<username>/cpython.git
+
 Listing the Remote Repositories
 -------------------------------
 
@@ -71,7 +83,14 @@ and ``upstream`` pointing to the official CPython repository::
    origin  git@github.com:<username>/cpython.git (fetch)
    origin  git@github.com:<username>/cpython.git (push)
    upstream        git@github.com:python/cpython.git (fetch)
-   upstream        git@github.com:python/cpython.git (push)
+   upstream        git@github.com:<username>/cpython.git (push)
+
+To verify the upstream for ``main``::
+
+   git config branch.main.remote
+
+It should emit ``upstream``, indicating to track/pull changes for ``main`` from the
+``upstream`` remote.
 
 
 .. _set-up-name-email: