Added author links for refs in ch5 (rotational motion).

content/rotationalmotion.md

@@ -697,7 +697,7 @@ We choose our coordinate system such that the origin is at the center of the ini
 
 [^3]: Photograph of Fernando Alonso during one of the practice sessions of the 2011 Malaysia Formula 1 race. Image by [Morio](https://commons.wikimedia.org/wiki/User:Morio), [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Fernando_Alonso_2011_Malaysia_FP1.jpg), CC BY-SA 3.0.
 
-[^4]: Image by Securiger, [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Bit_and_brace.JPG), CC BY-SA 3.0.
+[^4]: Image by [Securiger](https://en.wikipedia.org/wiki/User:Securiger), [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Bit_and_brace.JPG), CC BY-SA 3.0.
 
-[^5]: Image by Jayess, [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Drill004cropped.jpg), public domain.
+[^5]: Image by [Jayess](https://en.wikipedia.org/wiki/User:Jayess), [Wikimedia commons](https://commons.wikimedia.org/wiki/File:Drill004cropped.jpg), public domain.