Fix documentation for PrincipalComponentAnalysis

README.md

@@ -109,7 +109,7 @@ let result = ML.ArrayXY.sortX({ x: [2, 3, 1], y: [4, 6, 2] });
 
 ### Data preprocessing
 
-- Principal component analysis (PCA): [`ML.PrincipalComponentAnalysis`](https://github.com/mljs/pca)
+- Principal component analysis (PCA): [`ML.PCA`](https://github.com/mljs/pca)
 - Savitzky-Golay filter: [`ML.savitzkyGolay`](https://github.com/mljs/savitzky-golay)
 
 ### Utility