small update

doc/LectureNotes/_build/html/_sources/exercisesweek36.ipynb

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     "<!-- HTML file automatically generated from DocOnce source (https://github.com/doconce/doconce/)\n",
-    "doconce format html exercisesweek36.do.txt  -->\n",
+    "doconce format html exercisesweek36.do.txt --no_mako -->\n",
     "<!-- dom:TITLE: Exercises week 36 -->"
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     "### b) The singular value decomposition\n",
     "\n",
-    "Use the singular value decomposition of an $n\\times p$ matrix $\\boldsymbol{X}$ (our design matrix)"
+    "Here we will use the singular value decomposition of an $n\\times p$ matrix $\\boldsymbol{X}$ (our design matrix)"
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-    "where $\\boldsymbol{U}$ and $\\boldsymbol{V}$ are orthogonal matrices of dimensions\n",
+    "to study properties of Ridge regression and ordinary least squares regression.\n",
+    "Here $\\boldsymbol{U}$ and $\\boldsymbol{V}$ are orthogonal matrices of dimensions\n",
     "$n\\times n$ and $p\\times p$, respectively, and $\\boldsymbol{\\Sigma}$ is an\n",
     "$n\\times p$ matrix which contains the singular values only. This material was discussed during the lectures of week 35.\n",
     "\n",
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