CONTRIBUTING.rst formatting and a typo

CONTRIBUTING.rst

@@ -3,16 +3,17 @@ Contributing to biboumi
 
 Biboumi’s main workplace is at https://lab.louiz.org/louiz/biboumi
 
-The repository is also mirrored on other websites, for example on github, but
-that’s mainly for the convenience of users.
+The repository is also mirrored on other websites, for example on github,
+but that’s mainly for the convenience of users.
 
 Before doing anything, you can come on the `XMPP chatroom`_ to discuss your
 changes, issues or ideas.
 
 Bug reports, feature requests
 -----------------------------
-To open a bug report, or a feature request, please do so on
-`our gitlab’s bug tracker`_.
+
+To open a bug report, or a feature request, please do so on `our gitlab’s
+bug tracker`_.
 
 If the issue you’re reporting may have security implications, please select
 the “confidential” flag in your bug report.
@@ -20,15 +21,16 @@ the “confidential” flag in your bug report.
 
 Code
 ----
+
 To contribute code, you can do so using git: commit your changes on any
-publicly available git repository and communicate us its address.  This
-can be done with a `gitlab merge request`_, or a `github pull request`_
-or just by sending a message into the `XMPP chatroom`_.
+publicly available git repository and communicate us its address.  This can
+be done with a `gitlab merge request`_, or a `github pull request`_ or just
+by sending a message into the `XMPP chatroom`_.
 
-It is suggested that you use gitlab’s merge requests: this will automatically
-run our continuous integration tests.
+It is suggested that you use gitlab’s merge requests: this will
+automatically run our continuous integration tests.
 
-It is also recommended to add some unit or end-to-end tests for the prosposed
+It is also recommended to add some unit or end-to-end tests for the proposed
 changes.