reformat contribution docs

docs/source/guide/contributing.rst

@@ -23,23 +23,33 @@ Getting started
 ---------------
 
 1. Create an issue if one does not exist yet
-   a. Clearly describe the issues including the steps to reproduce it when it is a bug,
-   b. Ensure you fill in the earliest version that you know has the issue,
+
+   * Clearly describe the issues including the steps to reproduce it when it is a bug,
+
+   * Ensure you fill in the earliest version that you know has the issue
 2. Fork the repository on your GitLab account
+   
 3. Developing your changes:
-   a. Create a topic branch where you want to base your work,
-   b. Ensure you run the pre-commit hook before making a commit (install `pre-commit`_),
-   c. Run the test
+
+   * Create a topic branch where you want to base your work,
+  
+   * Ensure you run the pre-commit hook before making a commit (install `pre-commit`_),
+  
+   * Run the test
 
 .. code-block:: bash
 
     pytest tests/*
 
 4. Submitting changes
-   a. Push your changes to a topic branch in your fork of the repository,
-   b. Submit a Pull request to the repo of the smodex package, 
-   c. Update the issue to show that you have submitted code and ready for Merge review,
-   d. Our developers will take a look at your code and give responses to your changes
+
+   * Push your changes to a topic branch in your fork of the repository,
+  
+   * Submit a Pull request to the repo of the smodex package,
+  
+   * Update the issue to show that you have submitted code and ready for Merge review,
+  
+   * Our developers will take a look at your code and give responses to your changes
 
 
 .. _pre-commit: https://pre-commit.com/