Update learners/reference.md

ramGranell · kaitlinnewson · web-flow · commit 8c0e97578af4 · 2025-08-12T22:45:25.000+01:00
Co-authored-by: Kaitlin Newson &lt;kaitlin.newson@gmail.com&gt;
diff --git a/learners/reference.md b/learners/reference.md
@@ -34,7 +34,7 @@ title: Reference
 
 ### Shell: Interacting with Files
 
-**`mkdir`** - make a directory.
+**`mkdir`** - make a directory
 
 **`cat`** - print to shell or send file or files to output
 
