fix multi-line equation

docs/en/user_guides/datasets.md

@@ -101,7 +101,11 @@ afqmc_datasets = [
 ]
 ```
 > [!TIP]
-> Additionally, for binary evaluation metrics (such as accuracy, pass-rate, etc.), you can also set the parameter `k` in conjunction with `n` for [G-Pass@ k](http://arxiv.org/abs/2412.13147) evaluation. The formula for G-Pass@$k$ is: $$ G-Pass@k_\tau=\mathbb{E}_{Data}\left[ \sum_{j=\lceil \tau \cdot k \rceil}^c \frac{{c \choose j} \cdot {n - c \choose k - j}}{{n \choose k}} \right], $$ where $n$ is the number of evaluations, and $c$ is the number of times that passed or were correct out of $n$ runs. An example configuration is as follows:
+> Additionally, for binary evaluation metrics (such as accuracy, pass-rate, etc.), you can also set the parameter `k` in conjunction with `n` for [G-Pass@k](http://arxiv.org/abs/2412.13147) evaluation. The formula for G-Pass@k is:
+>
+> $$ G-Pass@k_\tau=\mathbb{E}_{Data}\left[ \sum_{j=\lceil \tau \cdot k \rceil}^c \frac{{c \choose j} \cdot {n - c \choose k - j}}{{n \choose k}} \right], $$ 
+>
+> where $n$ is the number of evaluations, and $c$ is the number of times that passed or were correct out of $n$ runs. An example configuration is as follows:
 
 ```python
 aime2024_datasets = [