Tweak contribution-related pages

doc/contributing/developing.md

@@ -82,11 +82,11 @@ The Web UI is written in `AngularJS`. To run it:
 
 We are available on different channels.
 
-## Slack
+### Slack
 
-Feel free to join OpenSlice's [Slack](https://openslice.slack.com) workspace for any development oriented questions (preferred).
+Feel free to join OpenSlice's [Slack](https://openslice.slack.com) workspace for any development oriented questions *(preferred)*.
 
-## E-mail
+### E-mail
 
 If you are a member or a participant, you can also reach out on the `OSL_TECH` mailing list.
 

doc/contributing/documenting.md

@@ -8,8 +8,11 @@ OpenSlice's documentation runs on [MkDocs](https://www.mkdocs.org/).
 ## Eligibility
 
 Documenting OpenSlice is limited to active contributors. So, if you:
+
 1. are an active member or participant;
+
 2. wish to contribute to it;
+
 3. you're ready!
 
 ## Documentation System and Structure