[gnome-control-center] docs: Fix markdown formatting

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 8643876965fb3adfd4aa7ba1e80dc57b474e020d
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Jul 22 20:23:19 2019 +0000

    docs: Fix markdown formatting

 docs/CONTRIBUTING.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/CONTRIBUTING.md b/docs/CONTRIBUTING.md
index b4d794080..01e0462be 100644
--- a/docs/CONTRIBUTING.md
+++ b/docs/CONTRIBUTING.md
@@ -18,9 +18,9 @@ Please note we have a Code of Conduct, please follow it in all your interactions
    component: <summary>
    ‌
    A paragraph explaining the problem and its context.
-‌
+   ‌
    Another one explaining how you solved that.
-‌
+   ‌
    <link to the issue>
    ```
 4. You may merge the pull request in once you have the sign-off of the maintainers, or if you