remove line breaks (#3909)

Author: Chris Elion

com.unity.ml-agents/Documentation~/com.unity.ml-agents.md

@@ -112,16 +112,11 @@ the documentation, you can checkout our [GitHUb Repository], which also includes
 a number of ways to [connect with us] including our [ML-Agents Forum].
 
 [unity ML-Agents Toolkit]: https://github.com/Unity-Technologies/ml-agents
-[unity inference engine]:
-  https://docs.unity3d.com/Packages/com.unity.barracuda@latest/index.html
-[package manager documentation]:
-  https://docs.unity3d.com/Manual/upm-ui-install.html
-[installation instructions]:
-  https://github.com/Unity-Technologies/ml-agents/blob/release_1_docs/docs/Installation.md
+[unity inference engine]: https://docs.unity3d.com/Packages/com.unity.barracuda@latest/index.html
+[package manager documentation]: https://docs.unity3d.com/Manual/upm-ui-install.html
+[installation instructions]: https://github.com/Unity-Technologies/ml-agents/blob/release_1_docs/docs/Installation.md
 [github repository]: https://github.com/Unity-Technologies/ml-agents
 [python package]: https://github.com/Unity-Technologies/ml-agents
-[execution order of event functions]:
-  https://docs.unity3d.com/Manual/ExecutionOrder.html
-[connect with us]:
-  https://github.com/Unity-Technologies/ml-agents#community-and-feedback
+[execution order of event functions]: https://docs.unity3d.com/Manual/ExecutionOrder.html
+[connect with us]: https://github.com/Unity-Technologies/ml-agents#community-and-feedback
 [ml-agents forum]: https://forum.unity.com/forums/ml-agents.453/