Update README.md

Author: ksator

README.md

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 # Documentation structure
 
-- [machine learning introduction](#machine-learning-introduction)  
-  - [Supervised learning](#supervised-learning)  
-  - [labeled dataset examples](#labeled-dataset-examples)  
-  - [Unsupervised learning](#unsupervised-learning)  
-  - [Clustering](#clustering)  
-  - [Classification](#classification)  
-  - [machine learning model](#machine-learning-model)  
-  - [k-Fold Cross-Validation](#k-fold-cross-validation)  
-  - [Signal vs Noise](#signal-vs-noise)  
-  - [Model fitting](#model-fitting)  
-  - [Overfitting](#overfitting)  
-  - [How to Detect Overfitting](#how-to-detect-overfitting)  
-  - [k-Fold Cross-Validation and overfitting](#k-fold-cross-validation-and-overfitting)  
-  - [How to Prevent Overfitting](#how-to-prevent-overfitting)  
-- [machine learning algorithms](#machine-learning-algorithms)
-  - [LinearSVC](#linearsvc)
-  - [Support vector classifier](#support-vector-classifier)
-  - [k-nearest neighbors](#k-nearest-neighbors)
-  - [DBSCAN](#dbscan)
-  - [k-means clustering](#k-means-clustering)
 - [Introduction to arrays using numpy](#introduction-to-arrays-using-numpy)    
 - [visualize a dataset using seaborn](#visualize-a-dataset-using-seaborn)  
 - [manipulate dataset with pandas](#manipulate-dataset-with-pandas)