message: Fix wording slightly
diff: @@ -12,7 +12,8 @@ Knowledge"](https://www.nature.com/articles/nature24270). More recently, this
  was archicture was extended for Chess and Shogi in ["Mastering Chess and Shogi
  by Self-Play with a General Reinforcement Learning
  Algorithm"](https://arxiv.org/abs/1712.01815). These papers will often be
  -abridged as *AG (AlphaGo)*, *AGZ (AlphaGo Zero)*, and *AZ (AlphaZero)*
  +abridged in documentation as *AG* (for AlphaGo), *AGZ* (for AlphaGo Zero), and
  +*AZ* (for AlphaZero) respectively
  The goal of this project is to reproduce the results of the original paper
  through an open-source implementation using the Google Cloud Platform and
  