Better description of gradient descent

Author: pjssilva

notebooks/week9/optimization.jl

@@ -337,9 +337,8 @@ Hoping for
 md"""
 # Stochastic Gradient Descent
 
-Pick one coordinate (or a few coordinates) to update at a time.
-This is what works in machine learning.
-
+Pick one term of the sum (or a few of them) and update according to the
+respective gradient. This is what works in machine learning.
 """
 
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@@ -1484,7 +1483,7 @@ version = "0.9.1+5"
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