README: FIX code block syntax highlighting.

JulienPalard · JulienPalard · commit b83b20369d18 · 2018-07-07T12:33:00.000+02:00
diff --git a/README.rst b/README.rst
@@ -58,7 +58,9 @@ You'll need to fork the `python-docs-fr
 button. This creates a copy of the whole project on your github
 account: a place where you have the rights to do modifications.
 
-Step by steps::
+Step by steps:
+
+.. code-block:: shell-session
 
     # Git clone your github fork using ssh (replace JulienPalard):
     $ git clone git@github.com:JulienPalard/python-docs-fr.git
@@ -70,7 +72,9 @@ Step by steps::
     $ git remote add upstream https://github.com/python/python-docs-fr.git
 
 
-Now you're ready to start a work session, each time you'll start a new task, start here::
+Now you're ready to start a work session, each time you'll start a new task, start here:
+
+.. code-block:: shell-session
 
     # To work, we'll need a branch, based on an up-to-date (freshly fetched)
     # upstream/3.7 branch, let's say we'll work on glossary so we name
@@ -227,12 +231,16 @@ Simplify git diffs
 
 Git diffs are often crowded with useless line number changes, like:
 
+.. code-block:: diff
+
     -#: ../Doc/library/signal.rst:406
     +#: ../Doc/library/signal.rst:408
 
 To tell git they are not usefull information, you can do the following
 after ensuring ``~/.local/bin/`` is in your ``PATH``.
 
+.. code-block:: bash
+
     cat <<EOF > ~/.local/bin/podiff
     #!/bin/sh
     grep -v '^#:' "\$1"
@@ -254,7 +262,9 @@ like::
   ├── python-docs-fr/
   └── cpython/
 
-To clone CPython you may use::
+To clone CPython you may use:
+
+.. code-block:: bash
 
   git clone --depth 1 --no-single-branch https://github.com/python/cpython.git
 
