Fix trailing whitespace to pass pre-commit hook

Author: phandangthoai

pywt/_cwt.py

@@ -85,8 +85,8 @@ def cwt(data, scales, wavelet, sampling_period=1., method='conv', axis=-1, *, ho
     
     References
     ----------
-    .. [1] Phan, D. T., Huynh, T. A., Pham, V. T., Tran, C. M., Mai, V. T., & Tran, N. Q. (2025). 
-           Optimal Scalogram for Computational Complexity Reduction in Acoustic Recognition Using Deep Learning. 
+    .. [1] Phan, D. T., Huynh, T. A., Pham, V. T., Tran, C. M., Mai, V. T., & Tran, N. Q. (2025).
+           Optimal Scalogram for Computational Complexity Reduction in Acoustic Recognition Using Deep Learning.
            *arXiv preprint arXiv:2505.13017*. https://arxiv.org/abs/2505.13017
 
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