Update q-learning.tex (#47)

typo in "states"

source-code/Pseudocode/q-learning/q-learning.tex

@@ -20,7 +20,7 @@
     \begin{algorithm}[H]
         \begin{algorithmic}
         \Require
-        \Statex Sates $\mathcal{X} = \{1, \dots, n_x\}$
+        \Statex States $\mathcal{X} = \{1, \dots, n_x\}$
         \Statex Actions $\mathcal{A} = \{1, \dots, n_a\},\qquad A: \mathcal{X} \Rightarrow \mathcal{A}$
         \Statex Reward function $R: \mathcal{X} \times \mathcal{A} \rightarrow \mathbb{R}$
         \Statex Black-box (probabilistic) transition function $T: \mathcal{X} \times \mathcal{A} \rightarrow \mathcal{X}$