Fix reinforcement-learning short_description length and duplication

Author: Tariolle

topics/reinforcement-learning/index.md

@@ -1,6 +1,6 @@
 ---
 display_name: Reinforcement learning
-short_description: Reinforcement learning is a machine learning paradigm focused on sequential decision-making, in which an autonomous agent learns optimal behavior by interacting with a dynamic environment to maximize cumulative reward signals.
+short_description: Reinforcement learning is a machine learning paradigm where agents learn optimal behavior through environment interaction.
 topic: reinforcement-learning
 wikipedia_url: https://en.wikipedia.org/wiki/Reinforcement_learning
 ---