Docs: Suggestion for version control learning objective (#77)

## Description

Added learning objective suggestion

<!-- Please delete as appropriate: -->
This PR needs a quick review.

## Checklist

- [x] Formatted Markdown
- [ ] Ran `just run-all`

sessions/version-control.qmd

@@ -12,7 +12,8 @@ library(downlit)
 
 This session's **overall learning outcome** is to:
 
-1.  
+1.  Get familiar with the principles and practical applications of
+    version control.
 
 **Specific objectives** are to: