feat: documents ensemble models

src/algorithm/neighbour/mod.rs

@@ -26,7 +26,8 @@
 //! * ["Faster cover trees." Izbicki et al., Proceedings of the 32nd International Conference on Machine Learning, ICML'15 (2015)](http://www.cs.ucr.edu/~cshelton/papers/index.cgi%3FIzbShe15)
 //! * ["The Elements of Statistical Learning: Data Mining, Inference, and Prediction" Trevor et al., 2nd edition, chapter 13](https://web.stanford.edu/~hastie/ElemStatLearn/)
 //!
-//! <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js?config=TeX-AMS_CHTML"></script>
+//! <script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
+//! <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 
 pub(crate) mod bbd_tree;
 /// tree data structure for fast nearest neighbor search