Update .CONTRIBUTING.md

Co-authored-by: Erin Shaben <[email protected]>

Author: brunopgalvao

.CONTRIBUTING.md

@@ -279,7 +279,7 @@ Related tutorials
 
 **Adding annotations**:
 
-Use assets from [.assets/annotations](.assets/annotations/) directory: 
+Use assets from the [.assets/annotations](.assets/annotations/) directory: 
 - **Arrows**: Highlight single elements
 - **Steps**: Highlight multiple elements (use numbers for numbered lists, letters for alphabetical lists)