[minor] Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -120,28 +120,28 @@ project:
 1. Fork the project, clone your fork,
    and configure the remotes:
 
-   ```bash
-   # Clone your fork of the repo into the current directory
-   git clone https://gitlab.insa-rennes.fr/<your-username>/<repo-name>
-   # Navigate to the newly cloned directory
-   cd <repo-name>
-   # Assign the original repo to a remote called "upstream"
-   git remote add upstream https://gitlab.insa-rennes.fr/mpcs/dfss
-   ```
+```bash
+# Clone your fork of the repo into the current directory
+git clone https://gitlab.insa-rennes.fr/<your-username>/<repo-name>
+# Navigate to the newly cloned directory
+cd <repo-name>
+# Assign the original repo to a remote called "upstream"
+git remote add upstream https://gitlab.insa-rennes.fr/mpcs/dfss
+```
 
 2. If you cloned a while ago, get the latest changes from upstream:
 
-   ```bash
-   git checkout <dev-branch>
-   git pull upstream <dev-branch>
-   ```
+```bash
+git checkout <dev-branch>
+git pull upstream <dev-branch>
+```
 
 3. Create a new topic branch (off the main project development branch) to
    contain your feature, change, or fix:
 
-   ```bash
-   git checkout -b <topic-branch-name>
-   ```
+```bash
+git checkout -b <topic-branch-name>
+```
 
 4. Commit your changes in logical chunks. Please adhere to these [git commit
    message guidelines](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
@@ -153,15 +153,15 @@ project:
 
 5. Locally merge (or rebase) the upstream development branch into your topic branch:
 
-   ```bash
-   git pull [--rebase] upstream <dev-branch>
-   ```
+```bash
+git pull [--rebase] upstream <dev-branch>
+```
 
 6. Push your topic branch up to your fork:
 
-   ```bash
-   git push origin <topic-branch-name>
-   ```
+```bash
+git push origin <topic-branch-name>
+```
 
 7. Open a Pull Request with a clear title and description.