Update index.rst

Author: tirthajyoti

docs/index.rst

@@ -32,7 +32,7 @@ Python” <https://heartbeat.fritz.ai/some-essential-hacks-and-tricks-for-machin
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 Essential tutorial-type notebooks on Pandas and Numpy
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 ===============
 
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 -  Logistic regression/classification
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 ===============
 
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 -  *K*-means clustering
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 ===========================
 
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 -  Principal component analysis